UNITED STATES

 SECURITIES AND EXCHANGE COMMISSION

 Washington, D.C. 20549

 FORM 10-K

 ANNUAL REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 For the fiscal year ended December 31, 2023

 TRANSITION REPORT UNDER SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 For the transition period from to

 Commission File No. 0-51891

 INTERNATIONAL STEM CELL CORPORATION

 (Exact name of registrant as specified in its charter)

 Delaware

 20-4494098

 (State of other jurisdiction of
 incorporation or organization)

 (I.R.S. Employer
 Identification Number)

 9745 Businesspark Ave
 San Diego, CA

 92131

 (Address of principal executive offices)

 (Zip Code)

 Registrant's telephone number: ( 760) 940-6383

 Securities registered pursuant to section 12(b) of the Act:

 Title of each class

 Trading symbol

 Name of each exchange on which registered

 None

 None

 None

 Securities registered pursuant to section 12(g) of the Act:

 Common Stock, $0.001 par value per share

 Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes No

 Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes No

 Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes No

 Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes No

 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act.

 Large accelerated filer

 Accelerated filer

 Non-accelerated filer

 Smaller reporting company

 Emerging growth company

 If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.

 Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.

 If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.

 Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to §240.10D-1(b).

 Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes No

 The aggregate market value of voting and non-voting common equity held by non-affiliates of the registrant was approximately $ 481,068 based upon the closing price of the common stock on June 30, 2023 (the last business day of the registrant's most recently completed second fiscal quarter) on the OTC QB Bulletin Board. Shares of common stock held by each officer, director and holder of five percent or more of the outstanding common stock have been excluded in that such persons may be deemed to be affiliates. This determination of affiliate status is not necessarily a conclusive determination for other purposes.

 As of March 25, 2024 there were 8,004,389 shares of the registrant's common stock outstanding.

 DOCUMENTS INCORPORATED BY REFERENCE

 Information from portions of the registrant's definitive Proxy Statement for its Annual Meeting of Stockholders to be held in 2024 is incorporated by reference into Part III of this Form 10-K.

 Page

 Cautionary Note Regarding Forward-Looking Statements

 i

 Item 1.

 Business

 Item 1A.

 Risk Factors

 Item 1B.

 Unresolved Staff Comments

 Item 1C.

 Cybersecurity

 Item 2.

 Properties

 Item 3.

 Legal Proceedings

 Item 4.

 Mine Safety Disclosures

 Item 5.

 Market for Registrant's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

 Item 6.

 [Reserved]

 Item 7.

 Management's Discussion and Analysis of Financial Condition and Results of Operations

 Item 7A.

 Quantitative and Qualitative Disclosures About Market Risk

 Item 8.

 Financial Statements and Supplementary Data

 Item 9.

 Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

 Item 9A.

 Controls and Procedures

 Item 9B.

 Other Information

 Item 9C.

 Disclosures Regarding Foreign Jurisdictions that Prevent Inspections

 Item 10.

 Directors, Executive Officers and Corporate Governance

 Item 11.

 Executive Compensation

 Item 12.

 Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

 Item 13.

 Certain Relationships and Related Transactions, and Director Independence

 Item 14.

 Principal Accounting Fees and Services

 Item 15.

 Exhibits, Financial Statement Schedules

 Item 16.

 Form 10-K Summary

 SIGNATURES

 CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

 This Annual Report on Form 10-K contains forward-looking statements. For example, statements regarding our expected financial position, business strategy and other plans and objectives for future operations, and assumptions and predictions about potential markets, future product demand, product development targets and expected timing, expenses, and sales are all forward-looking statements. These statements may be found in the items of this Annual Report entitled "Description of Business" and "Management's Discussion and Analysis of Financial Condition and Results of Operations," as well as in this Annual Report generally. These statements are generally accompanied by words such as "intend," "anticipate," "believe," "estimate," "potential(ly)," "continue," "forecast," "predict," "plan," "may," "will," "could," "would," "should," "expect," or the negative of such terms or other comparable terminology.

 We have based these forward-looking statements on our current expectations and projections about future events. We believe that the assumptions and expectations reflected in such forward-looking statements are reasonable, based on information available to us on the date hereof, but we cannot assure you that these assumptions and expectations will prove to have been correct or that we will take any action that we may presently be planning. However, these forward-looking statements are inherently subject to known and unknown risks and uncertainties. Actual results or experience may differ materially from those expected or anticipated in the forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, research and product development uncertainties, clinical trial results, regulatory policies and approval requirements, competition from other similar businesses, market and general economic factors, the availability of resources and the other risks discussed in Part I, Item 1A. Risk Factors of this Annual Report. This discussion should be read in conjunction with the consolidated financial statements and accompanying notes thereto included in this Annual Report.

 We have identified some of the important factors that could cause future events to differ from our current expectations and they are described in this Annual Report in the section entitled "Risk Factors" which you should review carefully. Please consider our forward-looking statements in light of those risks as you read this Annual Report. If one or more of these or other risks or uncertainties materialize, or if our underlying assumptions prove to be incorrect, actual results may vary materially from what we project. We do not undertake, and specifically decline any obligation, to update any forward-looking statements or to publicly announce the results of any revisions to any statements to reflect new information or future events or developments.

 i

 ITEM 1. BUSINESS

 Business Overview

 International Stem Cell Corporation (sometimes referred to herein as "ISCO", the "Company", "we", "us", or "our") is a clinical stage biotechnology company focused on therapeutic and biomedical product development with multiple long-term therapeutic opportunities and two revenue-generating businesses offering potential for increased future revenue.

 We currently have no revenue generated from our principal operations in therapeutic and clinical product development through research and development efforts. We have generated revenue from our two commercial businesses, anti-aging and research products, of a total of $7.8 million and $8.2 million for the years ended December 31, 2023 and 2022, respectively.

 Our products are based on multi-decade experience with human cell culture and a proprietary type of pluripotent stem cells, "human parthenogenetic stem cells" ("hpSCs"). Our hpSCs are comparable to human embryonic stem cells ("hESCs") in that they have the potential to be differentiated into many different cells in the human body. However, the derivation of hpSCs does not require the use of fertilized eggs or the destruction of human embryos and also offers the potential for the creation of immune-matched cells and tissues that are less likely to be rejected following transplantation. ISCO scientists have created the first parthenogenetic, homozygous stem cell line that can be a source of therapeutic cells for hundreds of millions of individuals with minimal immune rejection after transplantation. We have facilities and manufacturing processes that we believe comply with the requirements of current Good Manufacturing Practice ("GMP") standards as defined by the U.S. Code of Federal Regulations and promulgated by the Food and Drug Administration ("FDA").

 We are developing different cell types from our stem cells that may result in therapeutic products. We focus on applications where cell and tissue therapy are already proven but where there is an insufficient supply of functional cells or tissue. We believe that the most promising potential clinical application of our technology is for neural stem cells ("ISC-hpNSC ") for treatment of Parkinson's disease and potentially other central nervous system disorders, such as traumatic brain injury, stroke and Alzheimer's disease.

 Our most advanced project is the neural stem cell program for the treatment of Parkinson's disease. In 2013 we published in Nature Scientific Reports the basis for our patent on a new method of manufacturing neural stem cells which is used to produce the clinical-grade cells necessary for future clinical studies and commercialization. In 2014 we completed the majority of the preclinical research establishing the safety profile of neural stem cells ("NSC") in various animal species including non-human primates. In June 2016 we published the results of a 12-month pre-clinical non-human primate study that demonstrated the safety, efficacy and mechanism of action of the ISC-hpNSC. In 2017, we began our Phase I trial of ISC-hpNSC, human parthenogenetic stem cell-derived neural stem cells for the treatment of Parkinson's disease. This trial involves three groups, each with four patients, with each group receiving an increasing amount of ISC-hpNSC via intracerebral transplantation. Patients are evaluated for 12 months (active phase of the study) with an additional 5-year observational follow-up period to assess safety. We reported 12-month results from the first cohort and 6-month interim results of the second cohort at the Society for Neuroscience annual meeting (Neuroscience 2018) in November 2018. In April 2019, we announced the completion of subject enrollment, with the 12th subject receiving a transplantation of the highest dose of cells. There have been no safety signals or serious adverse effects seen to date as related to the transplanted ISC-hpNSC cells. We announced successful completion of the dose escalating phase 1 clinical trial in June 2021. In terms of preliminary efficacy, where scores are compared against baseline before transplantation, we observed a potential dose-dependent response, with an apparent peak effectiveness at our middle dose. The % OFF-Time, which is the time during the day when levodopa medication is not performing optimally and PD symptoms return, decreased an average 47% from the baseline at 12 months post transplantation in cohort 2. This trend continued through 24 months where the % OFF-Time in the second cohort dropped by 55% from the initial reading. The same was true for % ON-Time without dyskinesia, which is the time during the day when levodopa medication is performing optimally without dyskinesia. The % ON-Time increased an average of 42% above the initial evaluation at 12 months post-transplantation in the second cohort.

 Each of these product candidates will require extensive preclinical and clinical development and may require specific unforeseen licensing rights obtained at substantial cost before regulatory approval may be achieved and the products sold for therapeutic use.

 Additionally, we are subject to various other risks; for example, our business is at an early stage of development and we may not develop therapeutic products that can be commercialized; we have a history of operating losses, do not expect to be profitable in the near future and our independent registered public accounting firm has expressed substantial doubt as to our ability to continue as a going concern; and we will need additional capital to conduct our operations and develop our products and our ability to obtain the necessary funding is uncertain. Refer to Part I, Item 1A. Risk Factors for further discussion.

 Corporate Structure

 International Stem Cell Corporation is a Delaware corporation which has four wholly owned subsidiaries: International Stem Cell Corporation, a California corporation ("ISC California"), Lifeline Cell Technology, LLC ("LCT"), Lifeline Skin Care, Inc. ("LSC"), and Cyto Therapeutics.

 Cyto Therapeutics was registered in the state of Victoria, Australia in December 2014 and is a limited proprietary company and a wholly owned subsidiary of the Company. Cyto Therapeutics is a research and development company for the Therapeutic Market, which is conducting clinical trials in Australia for the use of ISC-hpNSC in the treatment of Parkinson's disease.

 Our principal executive offices are located at 9745 Businesspark Ave, San Diego, CA 92131, and our telephone number is (760) 940-6383. Our corporate website address is www.internationalstemcell.com, Lifeline Cell Technology's website address is www.lifelinecelltech.com, and Lifeline Skin Care's website address is www.lifelineskincare.com. Information found on, or accessible through, our websites is not a part of, and is not incorporated into, this Annual Report on Form 10-K. Our common stock is currently quoted on the OTC QB and trades under the symbol "ISCO".

 Frequently Asked Questions

 What are Stem Cells?

 Cells are the basic living units that make up humans, animals, plants and other organisms. Stem cells have two important characteristics that distinguish them from other types of cells. First, they can renew themselves for long periods of time. Second, they are unspecialized and under certain conditions can be induced to become cells with special functions such as metabolically active cells of the liver or transparent and protective cells of the eye. Until recently, scientists have worked with two major kinds of stem cells, embryonic stem cells (hESCs) and adult stem cells that each has different properties and characteristics. ISCO has developed a third category of stem cells named parthenogenetic stem cells (the hpSCs mentioned above) that promise to have significant therapeutic advantages relative to these other types.

 What are Pluripotent Stem Cells?

 Pluripotent stem cells are able to be differentiated or developed into virtually any other cell made in an organism. Both embryonic and parthenogenetic stem cells are pluripotent. Some scientists are exploring manipulation of adult cells into a potentially pluripotent stage. This type of stem cells is called induced pluripotent stem cells.

 What are Embryonic Stem Cells?

 Embryonic stem cells are derived from embryos at an early stage of development, typically when they are in a structure of a small number of cells called the blastocyst. Embryonic stem cells are expanded in a laboratory cell culture process. Once cell lines are established, batches of them can be frozen and shipped to other laboratories for further culture and experimentation.

 What are Adult Stem Cells?

 An adult stem cell is an undifferentiated cell found among differentiated cells in a tissue or organ. An adult stem cell can renew itself (generally to a lesser degree than can embryonic or parthenogenetic stem cells) and differentiate to a limited number of specialized cell types. These cells can be isolated from different tissues such as the bone marrow, fat tissue, and umbilical cord blood.

 Why are Embryonic Stem Cells Important?

 Human embryonic stem cells are able to differentiate into virtually any other cell in the body and to reproduce themselves almost indefinitely. In theory, if stem cells can be grown and their development directed in culture, it would be possible to grow cells for the treatment of specific diseases.

 An early potential application of human embryonic stem cell technology may be in drug screening and toxicology testing.

 The study of human development may also benefit from embryonic stem cell research in that understanding the events that occur at the first stages of development has potential clinical significance for preventing or treating birth defects, infertility and pregnancy loss. The earliest stages of human development have been difficult or impossible to study. Human embryonic stem cells offer insights into developmental events that cannot be studied directly in humans or fully understood through the use of animal models.

 What are Parthenogenetic Stem Cells and how are they different?

 Parthenogenetic stem cells are pluripotent stem cells created from unfertilized human eggs through a "parthenogenesis" process. Parthenogenesis requires that an unfertilized human egg be "activated" by chemical, physical or other means. Activation results in a non-viable "parthenote" from which pluripotent parthenogenetic stem cell lines can be derived. The cell lines used by ISCO are human parthenogenetic stem cells. Currently, ISCO owns the largest published collection of human parthenogenetic stem cell lines. Our research is based on perfecting proprietary techniques for deriving stem cells through parthenogenesis that result in stem cell lines that have the same capacity to become all cells found in the human body, but do not require use or destruction of a viable human embryo. Furthermore, parthenogenetic stem cells can be produced in a simplified ("homozygous") form that enables each line to be an immunological match for millions of people. We do not obtain stem cells from fetal tissue nor does our technology require the use of discarded frozen human embryos.

 Why Not Use Stem Cells Derived from Adults?

 There are several approaches now in human clinical trials that utilize adult stem cells. However, these cells have limited availability and limited ability to proliferate in culture as well as risk of genetic mutation. Therefore, obtaining clinically significant amounts of adult stem cells may prove to be difficult.

 Why is Stem Cell Research Controversial?

 The sources of some types of stem cells cause social and religious controversy. For example, some scientists obtain stem cells from aborted fetal tissue, causing opposition from those opposed to abortion. Another controversial source of stem cells is residual human embryos (from fertilized human eggs) that remain after vitro fertilization procedures and are used to create embryonic stem cell lines.

 Is Stem Cell Research Banned in the United States?

 Embryonic stem cell research, in general, is not banned in the United States. Work by private organizations is not limited except by the restrictions applicable to all human research. In addition, Proposition 71 in California, which voters approved in November 2004, specifically allows state funds to be used for stem cell research.

 Why Not Use the Currently "Approved" Embryonic Stem Cells Lines?

 Most, if not all, human embryonic stem cell lines in research now have complex ("heterozygous") immune compositions that are likely to cause the differentiated cells to be rejected by most patients.

 Why Not use Adult Cells Reprogrammed to become Pluripotent Cells?

 Induced pluripotent cells ("iPSs") benefit from not being derived from human embryos but may face a number of other limitations such as uncertainty as to which genes are turned on and off. Furthermore, like embryonic stem cells, iPSs have complex ("heterozygous") immune compositions that are likely to cause the differentiated cells to be rejected by most patients.

 Ethical Issues

 The use of embryonic stem cells derived from fertilized human eggs has created an ethical debate in the United States and around the world. However, since no fertilized human eggs are used in creating our stem cells and no human embryo is being created, used or destroyed, we expect that our parthenogenetic stem cells will be more readily accepted in circumstances where there are ethical concerns with using traditional embryonic stem cells.

 We also have licensed worldwide rights to use a technology known as Somatic Cell Nuclear Transfer ("SCNT") to create human stem cells. The President's Council on Bioethics, as reported in the publication "Reproduction and Responsibility—The Regulation of New Biotechnologies 2004," has agreed on a series of recommendations for the use of such technology. Countries such as the United Kingdom have made similar recommendations.

 Our Platform Technology

 We have developed a proprietary process based on parthenogenesis for the creation of a new type of stem cell that has shown to exhibit the pluripotency and proliferative benefits of embryonic stem cells yet avoid the use or destruction of fertilized human eggs or embryos. Furthermore, since parthenogenetic stem cells can be created with immunogenetically identical ("homozygous") chromosome

 pairs, each line has potential to be an immune match for tens of millions of patients. If such cells were to be differentiated into functional mature cells they would, theoretically, be universally applicable across a wide range of medical conditions.

 We also hold licenses to three other technologies to create human pluripotent stem cells: SCNT technology (as mentioned previously); a technology that may be useful to create induced pluripotent stem cells ("iPS"); and "single blastomere technology" which uses a single cell obtained from a fertilized blastocyst to create an embryonic stem cell line. Each of these technologies has unique cell therapy applications and provides us with a broad base of technologies from which we can operate in the future.

 Our Facilities

 We have built the capacity to manufacture human cells for research use in our research and development ("R&D") facility in San Diego, California and for preclinical and clinical trials and ultimately for therapeutic use through the completion of our cGMP manufacturing facility in Frederick, Maryland.

 Our Products

 Therapeutic Product Candidates

 We are developing different cell types from our stem cells that may result in therapeutic products. We focus on applications where cell and tissue therapy is already proven but where there is an insufficient supply of functional cells or tissue.

 We believe that the most promising potential clinical applications of our technology are Parkinson's disease ("PD"), traumatic brain injury ("TBI"), and stroke. Using our proprietary technologies and know-how, we are creating neural stem cells from hpSCs as a potential treatment of PD, TBI, and stroke.

 PD: Our most advanced project is the neural stem cell program for the treatment of Parkinson's disease. In 2013, we published in Nature Scientific Reports the basis for our patent on a new method of manufacturing neural stem cells, which is used to produce the clinical-grade cells necessary for future clinical studies and commercialization. In 2014, we completed the majority of the preclinical research, establishing the safety profile of NSC in various animal species, including non-human primates. In June 2016, we published the results of a 12-month pre-clinical non-human primate study, which demonstrated the safety, efficacy and mechanism of action of the ISC- hpNSC. In 2017, we dosed four patients in our Phase I trial of ISC-hpNSC, human parthenogenetic stem cell-derived neural stem cells for the treatment of Parkinson's disease. We reported 12-month results from the first cohort and 6-month interim results of the second cohort at the Society for Neuroscience annual meeting (Neuroscience 2018) in November 2018. In April 2019, we announced the completion of subject enrollment, with the 12th subject receiving a transplantation of the highest dose of cells. There have been no safety signals or serious adverse effects seen to date as related to the transplanted ISC-hpNSC cells.

 We announced a successful completion of the dose escalating phase 1 clinical trial in June 2021. In terms of preliminary efficacy, where scores are compared against baseline before transplantation, we observed a potential dose-dependent response with an apparent peak effectiveness at our middle dose. The % OFF-Time, which is the time during the day when levodopa medication is not performing optimally and PD symptoms return, decreased an average 47% from the baseline at 12 months post transplantation in cohort 2. This trend continued through 24 months where the % OFF-Time in the second cohort dropped by 55% from the initial reading. The same was true for % ON-Time without dyskinesia, which is the time during the day when levodopa medication is performing optimally without dyskinesia. The % ON-Time increased an average of 42% above the initial evaluation at 12 months post-transplantation in the second cohort.

 Stroke: In August 2014, we announced the launch of a stroke program, evaluating the use of ISC-hpNSC transplantation for the treatment of ischemic stroke using a rodent model of the disease. The Company has a considerable amount of safety data on ISC-hpNSC from the Parkinson's disease program and, as there is evidence that transplantation of ISC-hpNSC may improve patient outcomes as an adjunctive therapeutic strategy in stroke, having a second program that can use this safety dataset is therefore a logical extension. In 2015, the Company together with Tulane University demonstrated that NSC can significantly reduce neurological dysfunction after a stroke in animal models.

 TBI: In October 2016, we announced the results of the pre-clinical rodent study, evaluating the use of ISC-hpNSC transplantation for the treatment of TBI. The study was conducted at the University of South Florida Morsani College of Medicine. We demonstrated that animals receiving injections of ISC-hpNSC displayed the highest levels of improvements in cognitive performance and motor coordination compared to vehicle control treated animals. In February 2019, we published the results of the pre-clinical study in Theranostics, a prestigious peer-reviewed medical journal. The publication titled, "Human parthenogenetic neural stem cell grafts promote multiple regenerative processes in a traumatic brain injury model," demonstrated that the clinical-grade neural stem cells used

 in our Parkinson's disease clinical trial, ISC-hpNSC, significantly improved TBI-associated motor, neurological, and cognitive deficits without any safety issues.

 Each of these product candidates will require extensive preclinical and clinical development and may require specific unforeseen licensing rights obtained at substantial cost before any regulatory approval may be achieved and the products sold for therapeutic use.

 Anti-Aging Skin Care Products

 ISCO's wholly owned subsidiary Lifeline Skin Care, Inc. ("LSC") develops, manufactures and sells anti-aging skin care products based on two core technologies: encapsulated extract derived from hpSC and specially selected targeted small molecules. As of December 31, 2023, LSC's products include:

 • ProPlus Advanced Defense Complex

 • ProPlus Advanced Recovery Complex

 • ProPlus Eye Firming Complex

 • ProPlus Neck Firming Complex

 • ProPlus Advanced Aqueous Treatment

 • ProPlus Collagen Booster (Advanced Molecular Serum)

 • ProPlus Elastin Booster

 • ProPlus Brightening Toner

 LSC's products are regulated as cosmetics. LSC's products are sold domestically through a branded website, Amazon, and ecommerce partners.

 Research Products

 ISCO's LCT subsidiary develops, manufactures and commercializes over 200 human cell culture products. These products include frozen human "primary" cells and stem cells and the reagents (called "media") needed to grow, maintain and differentiate the cells. LCT's scientists have used a technique called basal medium optimization to systematically produce optimized products designed to culture specific human cell types and to elicit specific cellular behaviors. These techniques also produce products that do not contain non-human animal proteins, a feature desirable to research and therapeutic markets. These human cell-based products are used domestically and internationally by research scientists in pharmaceutical, academic and government research organizations to study human disease and basic cell biology. LCT's products eliminate the need for scientists to create their own cells, media and reagents or attempt to adapt "off the shelf" products to match specific experimental needs and they are superior to using animals or non-human animal cells as research tools because they are more relevant to the study of human disease. Strict quality assurance provides a high level of consistency and standardization of these products. LCT offers products that contain no animal products ("called "Xeno-free" products), allowing researchers to have better control of their experiments and to conduct research using products that ultimately can be more appropriate for therapeutic applications.

 Often LCT's research customers use our cell-based research products in their clinical research, eventually adapting them for therapeutic applications. If one of our research products is adopted by a successful producer of therapeutic cells, ISCO may become a supplier to the much larger therapeutic market through LCT's products. This is based on the fact that once regulatory product submissions are made to the FDA and similar authorities, the media and reagents used during development cannot be changed easily after approval. These uses of LCT's products bring opportunities to ISCO for future therapeutic products.

 LCT products and applications include:

 • Human skin cells and associated reagents for the study of skin disease, toxicology or wound healing.

 • Human cells from the heart and blood vessels and associated reagents (VascuLife), used by researchers to study cardiovascular disease and cancer.

 • Human bronchial and tracheal cells for the study of toxicity, cystic fibrosis, asthma and pathogenesis.

 • Human mammary epithelial cells for the study of breast cancer, three-dimensional culture and carcinogen screening.

 • Adult stem cells (called mesenchymal stem cells) and the reagents necessary to differentiate them into various tissues, including bone, cartilage and fat. These products are valuable for researchers in the emerging field of regenerative medicine.

 • Human prostate cells and specialized medium (ProstaLife™) to study prostate disease including cancer.

 • Human renal and bladder cells and associated media (RenaLife™) to study renal and bladder diseases.

 • Human corneal cells and associated media (OcuLife™) for the study of corneal disease and as a model of toxicology for consumer product testing.

 • Human female reproductive system cells (ReproLife™) for the study of cellular physiology of the reproductive tract, cellular response to infectious agents and other areas of female reproductive system research.

 • Human Skeletal Muscle Cells (StemLife Sk™) for the study of muscle cell biology, diabetes, insulin receptor studies, muscle metabolism, muscle tissue repair and myotube development.

 • An assortment of many other cell culture reagents and supplements for the growth, staining and freezing of human cells.

 Each LCT cell product is quality tested for the expression of specific markers (to assure the cells are the correct type), proliferation rate, viability, morphology and absence of pathogens. Each cell system also contains associated donor information and all informed consent requirements are strictly followed.

 LCT's research products are marketed and sold by its internal sales force, LCT brand distributors in Europe and Asia and original equipment manufacturing ("OEM") partners, which are then re-branded and sold with OEM partners' labels.

 Our Markets

 Therapeutic Markets

 ISCO is currently pursuing one clinical stage program and several scientific programs designed to lead to the creation of new therapeutic products. We anticipate that, with their superior immune-matching characteristics, our cells will be able to reduce or eliminate the need for immune-suppression drugs and the adverse reactions they trigger in patients.

 Parkinson's disease. Parkinson's disease ("PD") is the second most common neurodegenerative disease. According to the Parkinson's Disease Foundation, there are more than one million sufferers in the United States with over $2 billion spent on related medication costs. Currently there is no cure for PD and the improvements in symptoms provided by available PD drugs often diminish with time. Leveraging our proprietary technologies and know-how, we have developed neural stem cells derived from human pluripotent stem cells ("hpSCs") as a potential treatment for PD and other central nervous system diseases, including traumatic brain injury,in order to address this significant market opportunity.

 Traumatic Brain Injury. Over 1.7 million people in North America suffer annually from traumatic brain injury, with associated medical costs exceeding $70 billion. According to the World Health Organization, the global incidence for traumatic brain injury is approximately 10 million people annually. According to the CDC, traumatic brain injury is a leading cause of death and disability in the United States, contributing to about 30% of all injury deaths.

 Anti-Aging Cosmetic Market

 Skin care products play a key role in the daily healthcare routines of many consumers. Greater emphasis on advertising, broader and more integrated distribution networks, raising standards of living in emerging markets, and population aging trends in developed nations are the major factors driving the global demand for skin care products.

 The global skin care market is generally comprised of three categories of product – facial care, body care, and special needs products. Top selling products in the facial skincare category include skin brighteners, anti-aging creams and serums, toners, masks, anti-acne and sun protection products.

 Facial skincare products that provide anti-aging benefits represent a significant portion of the global skincare market. Increased longevity leads consumers to seek out high quality, technologically advanced skincare products that can help them maintain a youthful appearance. Anti-aging products that are backed by scientific research remain in high demand among sophisticated consumers despite premium prices.

 Research Market

 The research market for cell systems consists of scientists performing basic and applied research in the biological sciences. Basic research involves the study of cell biology and biochemical pathways. Applied research involves drug discovery, vaccine development, clinical research and cell transplantation. The domestic market can be broken into three segments: (i) academic researchers in universities and privately-funded research organizations; (ii) government institutions such as the National Institutes of Health, the United States Army, the United States Environmental Protection Agency and others; and (iii) industrial organizations such as pharmaceutical companies and consumer product companies. It is estimated that the combined academic and government markets comprise approximately 40% of the total market and that the industrial segment comprises approximately 60%. We believe the following are the main drivers in the research market for commercial cell systems:

 • The need for experimental human cells which are more predictive of human biology than are non-human cells or genetically-modified cell lines or living non-human animals.

 • The emerging field of stem-cell-based regenerative medicine and the increase in associated grant money to study stem cells is driving the market not only for stem cell products but also for cell culture products in general.

 • The desire to lower the cost of drug development in the pharmaceutical industry. We believe that human cell systems may provide a platform for screening toxic drugs early in the development process, thus avoiding late stage failures in clinical trials and reducing costs.

 • The need to eliminate animal products in research reagents that may contaminate future therapeutic products.

 • The need for experimental control. Serum-free defined media provides the benefit of experimental control because there are fewer undefined components.

 • The need for consistency in experiments that can be given by quality-controlled products.

 • The need to eliminate in-house formulation of media, obtain human tissue or perform cell isolation.

 • The need to reduce animal testing in the consumer products industry.

 Intellectual Property

 Patents

 In 2022, ISCO was issued one patent for technology generated by our R&D team. The patent, issued in the USA, covers the use of Parthenogenic Activation of Human Oocytes. As of December 31, 2023, we held a total of 39 patents. These patents expire from January 2025 through May 2037.

 In addition, we have obtained exclusive worldwide licenses to patents and patent applications from Astellas Pharma. We believe that our licensed and internally-generated patents provide the intellectual property rights we need to operate in the pluripotent stem cell field and to progress through the stages of creating a therapeutic stem cell product. These stages include the derivation, isolation, expansion and differentiation of stem cells. The intellectual property available to us enables us to create manufacturing methods that eliminate animal proteins in order to satisfy FDA requirements. In addition, we have rights to sell research products derived through our licensed intellectual property in order to generate income.

 The majority of the patents and applications have been filed in the US and in foreign countries through the Patent Cooperation Treaty or by direct country filings in those jurisdictions deemed significant to our operations.

 We have protected our research products and branding through both patents and trademarks. Lifeline Skin Care has filed patent applications covering its proprietary core technologies and methods of using stem cells and targeted small molecules to create skin care products. LSC unique product formulas are protected as trade secrets. ISCO, LCT, and LSC have registered trademarks on their company names, logos and various product names to protect their branding investment. Lifeline Cell Technology's reagent formulations are protected as trade secrets.

 The patentability of human cells in countries throughout the world reflects widely differing governmental attitudes. In the United States, hundreds of patents covering human embryonic stem cells have already been granted, including those on which we rely. Certain countries in Europe and Asia have taken the position that hES cells themselves are not patentable. ISCO believes that such restrictions are not appropriate as applied to parthenogenetic stem cells and is working with patent legislators in Europe to create exemptions for human parthenogenetic stem cells. As a result, we plan to file internationally wherever feasible and focus our research strategy on cells that best fit the US and foreign country definitions of patentable cells and technologies.

 In December 2014, the Court of Justice of the European Union (CJEU), the European Union's highest court ruled that the Company's core technology patent applications are not covered by the prohibition on patenting embryonic stem cells, removing the final barrier to the approval of ISCO's parthenogenetic stem cell patents in the European Union. This final and definitive ruling by the EU's highest court now formally separates parthenogenetic stem cells from embryonic stem cells and removes the exclusion from patentability on the former while maintaining the ban on the later.

 License Agreements

 In May 2005, we entered into three exclusive license agreements ("ACT IP," "Infigen IP," and "UMass IP" or collectively "ACTC agreements") with Astellas Pharma Inc. ("Astellas") for the production of therapeutic products in the fields of diabetes, liver disease, retinal disease and the creation of research products in all fields. In February 2013, each of these license agreements was amended and restated, pursuant to which we continue to have rights to Astellas Pharma's human cell patent portfolio and non-exclusive rights to future developments in the area of diabetes and liver disease, as well as certain rights to patents covering Single Blastomere technology. A significant feature of the licensed Single Blastomere technology is a method of ethically obtaining human embryonic stem cells that allows us to isolate and differentiate hES stem cells directly from a "blastocyst" without harming the embryo. Using other licensed technology, the hES cells can be immediately differentiated into stem cells capable of expansion and differentiation into other types of cells. Under the terms of the amendments, we have also acquired additional exclusive rights in the area of parthenogenesis and the use of parthenogenetically derived stem cells for treatment of human diseases.

 The agreements with Astellas further provide that we are no longer obligated to make milestone payments or to meet any minimum research and development requirements. We will no longer pay any royalties related to the ACT IP or Infigen IP, and our obligation to pay a minimum license fee for the UMass IP has been reduced to $75 thousand annually, payable in two installments to Astellas.

 The agreements continue until the expiration of the last valid claim within the licensed patent rights. Either party to each amended and restated license agreement may terminate the agreement for an uncured breach or we may terminate the agreements at any time with a 30-day written notice.

 Research Agreements

 ISCO actively pursues sponsored research agreements with local and international research organizations and has established research collaborations with collaborators from Yale University, University of South Florida, Tulane University, University of California, San Diego, The Scripps Research Institute (La Jolla), and the Sanford Burnham Preby Medical Discovery Institute. We are in frequent negotiations to develop collaborative research agreements with additional domestic and international research organizations from both the public and private sector. These agreements allow us to team up with nationally and internationally known research scientists to study stem cell technologies developed or licensed by ISCO for possible use in therapeutic or research fields. In addition to the research collaborations mentioned above, we provide our stem cell lines to researchers at many universities and other research facilities. Ordinarily, the stem cell lines are provided without charge, but we retain the right to either an exclusive or non-exclusive right to use any technology that may be developed that is necessary in order for us to make therapeutic products based on the research that uses our cells.

 Competition

 The development of therapeutic and diagnostic agents for human disease is intensely competitive. Pharmaceutical companies currently offer a number of pharmaceutical products to treat Parkinson's disease, diabetes, liver diseases, and other diseases for which our technologies may be applicable. Many pharmaceutical and biotechnology companies are investigating new drugs and therapeutic approaches for the same purposes, which may achieve new efficacy profiles, extend the therapeutic window for such products, alter the prognosis of these diseases, or prevent their onset. We believe that our therapeutic products, when and if successfully developed, will compete with these products principally on the basis of improved and extended efficacy and safety and their overall economic benefit to the health care system. We believe that our most significant competitors will be fully integrated pharmaceutical companies and more established biotechnology companies. Smaller companies may also be significant competitors, particularly through collaborative arrangements with large pharmaceutical or biotechnology companies.

 Some of our primary competitors in the development of stem cell therapies are BioTime, SanBio, BlueRock Therapeutics, and ReNeuron. Our primary competitors in the skin care market are Obagi, ZO Skin Health, Skinceuticals, SkinMedica (a subsidiary of Allergan), and Murad. In the field of research products, our primary competitors for human cells, media and reagents are Lonza, EMD Millipore, Life Technologies (a subsidiary of Thermo Fisher Scientific), StemCell Technologies, Zen-bio, PromoCell, and Specialty Media. In each of these areas many of our competitors have substantially greater resources and experience than we do.

 Sales and Marketing

 To date, sales of our research products have been derived primarily through our in-house sales force and via OEM partners and LCT brand distributors in Europe and Asia. Approximately 46% of our total product sales for the year ended December 31, 2023 were from one customer.

 LSC phased out its retail product line in 2019, with the exception of select cleanser products that were offered to both professional and retail customers. LSC is now offering its ProPLUS product line through its branded website – www.lifelineskincare.com, as well as through a network of select online retailers and a limited number of professional accounts, such as dermatologists, and plastic surgeons. Domestically, we plan to increase distribution of our products through increasing brand awareness, strategic partnerships, and sales promotions.

 Government Regulation

 Regulation by governmental authorities in the United States and other countries is a significant factor in development, manufacture and marketing of our proposed therapeutic and skin care products and in our ongoing research and product development activities. The nature and extent to which such regulation applies to us will vary depending on the nature of any products that we may develop. We anticipate that many, if not all, of our proposed therapeutic products will require regulatory approval by governmental agencies prior to commercialization. In particular, human therapeutic products are subject to rigorous pre-clinical and clinical testing and other approval procedures of the FDA, and similar regulatory authorities in European and other countries. Various governmental statutes and regulations also govern or influence testing, manufacturing, safety, labeling, storage and recordkeeping related to such products and their marketing. The process of obtaining these approvals and the subsequent compliance with appropriate statutes and regulations require the expenditure of substantial time and money, and there can be no guarantee that approvals will be granted.

 We have made extensive progress in obtaining the necessary regulatory approvals of research protocols, informed consent documents and donor protection procedures to obtain oocytes in the United States for the production of our parthenogenetic stem cell bank. These approvals include: federally mandated Institutional Review Board ("IRB") and State of California required Stem Cell Research Oversight ("SCRO") committee.

 FDA Approval Process

 Prior to commencement of clinical studies involving humans, pre-clinical testing of new pharmaceutical products is generally conducted on animals in the laboratory to evaluate the potential efficacy and safety of the product candidate. The results of these studies are submitted to the FDA as a part of an Investigational New Drug ("IND") application, which must become effective before clinical testing in humans can begin. Typically, human clinical evaluation involves a time-consuming and costly three-phase process. In Phase I, clinical trials are conducted with a small number of people to establish safety pattern of drug distribution and metabolism within the body. In Phase II, clinical trials are conducted with groups of patients afflicted with a specific disease in order to determine preliminary efficacy, possible dosages and expanded evidence of safety. In some cases, an initial trial is conducted in diseased patients to assess both preliminary efficacy and preliminary safety and patterns of drug metabolism and distribution, in which case it is referred to as a Phase I/II trial. In Phase III, large-scale, multi-center, comparative trials are conducted with patients afflicted with a target disease in order to provide enough data to demonstrate the efficacy and safety required by the FDA. The FDA closely monitors the progress of each of the three phases of clinical testing; and may, at its discretion, re-evaluate, alter, suspend or terminate the testing based upon the data which have been accumulated to that point and its assessment of the risk/benefit ratio to the patient. Monitoring of all aspects of the study to minimize risks is a continuing process. All adverse events must be reported to the FDA.

 The results of the pre-clinical and clinical testing on a non-biologic drug and certain diagnostic drugs are submitted to the FDA in the form of a New Drug Application ("NDA") for approval prior to commencement of commercial sales. In the case of vaccines or gene and cell therapies, the results of clinical trials are submitted as a Biologics License Application ("BLA"). In responding to a NDA or BLA, the FDA may grant marketing approval, request additional information or refuse to approve if the FDA determines that the application does not satisfy its regulatory approval criteria. There can be no assurance that approvals will be granted on a timely basis, if at all, for any of our proposed products.

 In November 2014, in an important ruling the FDA cleared ISCO's human parthenogenetic stem cells line for investigational clinical use. This was a necessary step in the process of eventually advancing stem cell therapies based on ISCO's core technology into clinical development. Although the Phase I trial for the Parkinson's Disease program is anticipated to be conducted in Australia, and therefore not subject to FDA oversight, any future studies will likely be carried out in the United States where this approval is necessary.

 In recognition of the challenges that accompany development of cellular therapy ("CT") products, the FDA has recently initiated an expedited review and approval process for promising investigational CTs. The first step in the pathway is submission of a request for

 Regenerative Medicine Advanced Therapy ("RMAT") designation by the sponsor to the FDA, either at the same time as the initial IND filing or by amendment to an active IND (prior to the end-of-phase 2 meeting). Upon grant of RMAT designation by the FDA, the sponsor receives access to a number of benefits, the most advantageous of which is early interactions with senior FDA managers for the purpose of discussing potential surrogate or intermediate clinical endpoints to support accelerated approval requirements. Consideration for accelerated approval, heretofore unavailable to regenerative medicine products, represents a major regulatory advance because it would enable ISCO to market ISC-hpNSC earlier than would be possible through the traditional approval process.

 European and Other Regulatory Approval

 Whether or not FDA approval has been obtained, approval of a product by comparable regulatory authorities in Europe and other countries will likely be necessary prior to commencement of marketing the product in such countries. The regulatory authorities in each country may impose their own requirements and may refuse to grant an approval, or may require additional data before granting it, even though the relevant product has been approved by the FDA or another authority. As with the FDA, the regulatory authorities in the European Union ("EU"), Australia and other developed countries have lengthy approval processes for pharmaceutical products. The process for gaining approval in particular countries vary, but generally follows a similar sequence to that described for FDA approval. In Europe, the European Committee for Proprietary Medicinal Products provides a mechanism for EU-member states to exchange information on all aspects of product licensing. The EU has established a European agency for the evaluation of medical products, with both a centralized community procedure and a decentralized procedure, the latter being based on the principle of licensing within one member country followed by mutual recognition by the other member countries.

 In Australia, the approval process for commencing Phase 1 and 2 clinical trials resides with Therapeutic Goods Administration ("TGA") and the Human Research Ethics Committee ("HREC"). Prior to commencing a clinical trial, a sponsor must submit to TGA a CTX or CTN application and must submit to the HREC a study protocol, an investigator brochure, and a template informed consent for such clinical trial. The HREC approval process generally takes four to eight weeks.

 Other Regulations

 We are also subject to various United States federal, state, local and international laws, regulations, and recommendations relating to the treatment of oocyte donors, the manufacturing environment under which human cells for therapy are derived, safe working conditions, laboratory and manufacturing practices and the use and disposal of hazardous or potentially hazardous substances, including radioactive compounds and infectious disease agents, used in connection with our research work. We cannot accurately predict the extent of government regulation which might result from future legislation or administrative action.

 Other Regulations for Lifeline Skin Care

 The Federal Food, Drug and Cosmetic Act ("FFDCA") and the Fair Packaging and Labeling Act ("FPLA") provide the regulatory framework for selling cosmetics. The FFDCA oversees the safety of cosmetics. The FPLA ensures that the labeling is not false or misleading and includes all relevant information in a prominent and conspicuous manner.

 Safety and efficacy testing of the products is performed by independent third-party testing organization.

 Information about our Executive Officers

 For information concerning our executive officers, refer to Part III, Item 10. Directors, Executive Officers and Corporate Governance of this Annual Report on Form 10-K.

 Human Capital

 As of December 31, 2023, including our 2 executive officers, we had 29 full-time employees. None of our employees are represented by labor unions or covered by collective bargaining agreements.

 The Company considers its diverse and innovative workforce to be one of its most valuable resources. In recognition of our employees' contributions to the Company's business objectives and long-term research and business success, we strive to provide a dynamic, safe, and inclusive work environment that enables each employee to develop professionally as part of the team, as well as be rewarded for individual initiative. In order to achieve this goal, we focus on the following aspects of human capital management:

 Corporate Values and Ethics

 The key elements of our corporate value system are described in our Code of Business Conduct Policy (the "Business Code"), which provides uniform guidance to all our employees regarding expectations for proper workplace behavior and ethical decision making. Our Board of Directors adopted and regularly reviews the Code of Business Conduct, which applies to all of our employees, officers and directors of the Company.

 The values outlined in the Business Code, including personal honesty, professional integrity, and organizational transparency, are vital to achieving our business and research objectives, as well as to serving our stakeholders. We have established a reporting hotline that enables employees to file anonymous reports of any suspected violations of the Business Code or other policies.

 Workplace Diversity and Inclusion

 As a truly international team, we value and celebrate unique talents, backgrounds, and perspectives each employee contributes to achieving our corporate and research objectives. As an equal opportunity employer, we strive to ensure we evaluate a diverse group of candidates for every role with the goal of identifying the best possible candidates to fill open positions within the Company.

 Compensation & Benefits

 Our compensation and benefits programs, with oversight from the Compensation Committee of our Board of Directors, are designed to attract, retain and reward employees through competitive salaries, incentive bonus and stock option grant eligibility, a 401(k) Plan, healthcare and insurance benefits, paid time off, family leave, and employee assistance programs.

 ITEM 1A. RISK FACTORS

 You should carefully consider the risks described below as well as other information provided to you in this document, including information in the section of this document entitled "Forward Looking Statements". If any of the following risks actually occur, our business, financial condition or results of operations could be materially adversely affected, the value of our common stock could decline, and you may lose all or part of your investment.

 Risks Related to Our Business

 Our business is at an early stage of development, and we may not develop therapeutic products that can be commercialized.

 Our business is at an early stage of development. We do not have any products in late-stage clinical trials. We are still in the early stages of identifying and conducting research on potential therapeutic products. Our potential therapeutic products will require significant research and development and pre-clinical and clinical testing prior to regulatory approval in the United States and other countries. We may not be able to obtain regulatory approvals, enter new and later stage clinical trials for any of our product candidates, or commercialize any products. Our product candidates may prove to have undesirable and unintended side effects or other characteristics adversely affecting their safety, efficacy or cost effectiveness that could prevent or limit their use. Any product using any of our technology may fail to provide the intended therapeutic benefits, or achieve therapeutic benefits equal to or better than the standard of treatment at the time of testing or production.

 We have a history of operating losses, do not expect to be profitable in the near future.

 We have not generated any profits since our entry into the biotechnology business and have incurred significant operating losses. We expect to incur additional operating losses for the foreseeable future, and we expect our operating losses to increase significantly. Our commercial businesses have not generated revenues in amounts to support our research and development efforts, and we may not achieve that level of revenues in the foreseeable future.

 We have expended substantial funds to develop our technologies, products, and product candidates. Based on our financial condition, recurring losses, and projected spending, which raise substantial doubt about our ability to continue as a going concern. If we were unable to continue as a going concern, the values we receive for our assets on liquidation or dissolution could be significantly lower than the values reflected in our consolidated financial statements.

 We will need additional capital to conduct our operations and develop our products and our ability to obtain the necessary funding is uncertain.

 During the year ended December 31, 2023, we used a significant amount of cash to finance our continued operations, and we need to obtain significant additional capital resources in order to develop products going forward. We may not be successful in maintaining our normal operating cash flow and the timing of our capital expenditures may not result in cash flows sufficient to sustain our operations through the next twelve months. If financing is not sufficient and additional financing is not available or available only on terms that are detrimental to our long-term survival, it could have a major adverse effect on our ability to pursue our clinical research and product development programs and could ultimately affect our ability to continue to function. The timing and degree of any future capital requirements will depend on many factors, including:

 • the accuracy of the assumptions underlying the estimates for capital needs in 2024 and beyond;

 • the extent that revenues from sales of LSC and LCT products cover the related costs and provide capital;

 • scientific progress in our research and development programs;

 • the magnitude and scope of our research and development programs and our ability to establish, enforce and maintain strategic arrangements for research, development, clinical testing, manufacturing and marketing;

 • our progress with pre-clinical development and clinical trials;

 • the extent to which third party interest in Company's research and commercial products can be realized through effective partnerships;

 • the time and costs involved in obtaining regulatory approvals;

 • the costs involved in preparing, filing, prosecuting, maintaining, defending and enforcing patent claims;

 • the number and type of product candidates that we pursue; and

 • the development of major public health concerns, such as the novel coronavirus outbreak or other pandemics arising globally, and its impact on our business operations and funding requirements.

 Additional financing through strategic collaborations, public or private equity or debt financings or other financing sources may not be available on acceptable terms, or at all. Additional equity financing could result in significant dilution to our stockholders, and any debt financings will likely involve covenants restricting our business activities. Additional financing may not be available on acceptable terms, or at all. Further, if we obtain additional funds through arrangements with collaborative partners, these arrangements may require us to relinquish rights to some of our technologies, product candidates or products that we might otherwise seek to develop and commercialize on our own. If sufficient capital is not available, we may be required to delay, reduce the scope of or eliminate one or more of our research or product development initiatives, any of which could have a material adverse effect on our financial condition or business prospects.

 We have limited clinical testing and regulatory capabilities, and human clinical trials are subject to extensive regulatory requirements, very expensive, time-consuming and difficult to design and implement. Our products may fail to achieve necessary safety and efficacy endpoints during clinical trials, which may limit our ability to generate revenues from therapeutic products.

 Due to the relatively early stage of our therapeutic products and stem cell therapy-based systems, we have not yet invested significantly in internal clinical testing and regulatory capabilities, including for human clinical trials. We cannot assure you that we will be able to invest or develop resources for these capabilities successfully or as expediently as necessary. In particular, human clinical trials can be very expensive and difficult to design and implement, in part because they are subject to rigorous regulatory requirements. The clinical trial process is time consuming. We estimate that clinical trials of our product candidates will take at least several years to complete. Furthermore, failure can occur at any stage of the trials, and we could encounter problems that cause us to abandon or repeat clinical trials. The commencement and completion of clinical trials may be affected by several factors, including:

 • unforeseen safety issues;

 • determination of dosing issues;

 • inability to demonstrate effectiveness during clinical trials;

 • slower than expected rates of patient recruitment;

 • inability to monitor patients adequately during or after treatment;

 • competitive developments, including changes in the standard of care treatment for an indication;

 • inability or unwillingness of medical investigators to follow our clinical protocols; and

 • developments related to major health concerns, such as the novel coronavirus outbreak, and its impact on the costs and timing associated with the conduct of our clinical trials and other related activities.

 In addition, we or the FDA (or other applicable regulatory agency) may suspend our clinical trials at any time if it appears that we are exposing participants to unacceptable health risks or if the FDA or other regulatory agency finds deficiencies in our submissions or the conduct of these trials.

 Patents held by other persons may result in infringement claims against us that are costly to defend and which may limit our ability to use the disputed technologies and prevent us from pursuing research and development or commercialization of potential products.

 A number of pharmaceutical, biotechnology and other companies, universities and research institutions have filed patent applications or have been issued patents relating to cell therapy, stem cells, and other technologies potentially relevant to or required by our expected products. We cannot predict which, if any, of such applications will issue as patents or the claims that might be allowed. We are aware that a number of companies have filed applications relating to stem cells. We are also aware of a number of patent applications and patents claiming use of stem cells and other modified cells to treat disease, disorder or injury.

 If third party patents or patent applications contain claims infringed by either our licensed technology or other technology required to make and use our potential products and such claims are ultimately determined to be valid, we might not be able to obtain licenses to these patents at a reasonable cost, if at all, or be able to develop or obtain alternative technology. If we are unable to obtain such licenses at a reasonable cost, we may not be able to develop some products commercially. We may be required to defend ourselves in court against allegations of infringement of third-party patents. Patent litigation is very expensive and could consume substantial resources and create significant uncertainties. An adverse outcome in such a suit could subject us to significant liabilities to third parties, require disputed rights to be licensed from third parties, or require us to cease using such technology.

 The outcome of pre-clinical, clinical and product testing of our products is uncertain, and if we are unable to satisfactorily complete such testing, or if such testing yields unsatisfactory results, we may be unable to sell our proposed products.

 Before obtaining regulatory approvals for the commercial sale of any potential human products, our products will be subjected to extensive pre-clinical and clinical testing to demonstrate their safety and efficacy in humans. The clinical trials of our prospective products, or those of our licensees or collaborators, may not demonstrate the safety and efficacy of such products at all, or to the extent necessary to obtain appropriate regulatory approvals. Similarly, the testing of such prospective products may not be completed in a timely manner, if at all, or only after significant increases in costs, program delays or both, all of which could harm our ability to generate revenues. In addition, our prospective products may not prove to be more effective for treating disease or injury than current therapies. Accordingly, we may have to delay or abandon efforts to research, develop or obtain regulatory approval to market our prospective products. The failure to adequately demonstrate the safety and efficacy of a therapeutic product under development could delay or prevent regulatory approval of the product and could harm our ability to generate revenues, operate profitably or produce any return on an investment in us.

 Even if we are successful in developing a therapeutic application using our cell technologies, it is unclear whether cell therapy can serve as the foundation for a commercially viable and profitable business.

 Stem cell technology is rapidly developing and could undergo significant change in the future. Such rapid technological development could result in our technologies becoming obsolete. While our product candidates appear promising, they may fail to be successfully commercialized for numerous reasons, including, but not limited to, competing technologies for the same indications. There can be no assurance that we will be able to develop a commercially successful therapeutic application for our stem cell technologies.

 Moreover, advances in other treatment methods or in disease prevention techniques could significantly reduce or entirely eliminate the need for our cell therapy services, planned products and therapeutic efforts. There is no assurance that cell therapies will achieve the degree of success envisioned by us in the treatment of disease. Additionally, technological or medical developments may materially alter the commercial viability of our technology or services and require us to incur significant costs to replace or modify programs in which we have a substantial investment. We are focused on cell therapy, and if this field is substantially unsuccessful, this could jeopardize our success or future results. The occurrence of any of these factors may have a material adverse effect on our business, operating results and financial condition.

 Our competition includes fully integrated biotechnology and pharmaceutical companies that have significant advantages over us.

 The market for therapeutic stem cell products is highly competitive. We expect that our most significant competitors will be fully integrated and more established pharmaceutical and biotechnology companies. These companies are developing stem cell-based products and they have significantly greater capital resources and research and development, manufacturing, testing, regulatory compliance, and marketing capabilities. Many of these potential competitors are further along in the process of pharmaceutical product development and also operate large, company-funded research and development programs. As a result, our competitors may develop more competitive or affordable products, or achieve earlier patent protection or product commercialization than we are able to achieve. Competitive products may render any products or product candidates that we develop uneconomic or obsolete.

 If competitors develop and market products that are more effective, safer, or less expensive than our product candidates or offer other advantages, our commercial prospects will be limited.

 Our cell therapy development programs face, and will continue to face, intense competition from pharmaceutical, biopharmaceutical and biotechnology companies, as well as numerous academic and research institutions and governmental agencies engaged in drug discovery activities or funding, both in the United States and abroad. Some of these competitors are pursuing the development of drugs and other therapies that target the same diseases and conditions that we are targeting with our product candidates.

 As a general matter, we also face competition from many companies that are researching and developing cell therapies. Many of these companies have financial and other resources substantially greater than ours. In addition, many of these competitors have significantly greater experience in testing pharmaceutical and other therapeutic products, obtaining FDA and other regulatory approvals, and marketing and selling. If we ultimately obtain regulatory approval for any of our product candidates, we also will be competing with respect to manufacturing efficiency and marketing capabilities, areas in which we have limited or no commercial-scale experience. Mergers and acquisitions in the pharmaceutical and biotechnology industries may result in even more resources being concentrated by our competitors. Competition may increase further as a result of advances made in the commercial applicability of our technologies and greater availability of capital for investment in these fields.

 Restrictive and extensive government regulation could slow or hinder our production of a cellular product.

 The research and development of stem cell therapies is subject to and restricted by extensive regulation by governmental authorities in the United States and other countries. The process of obtaining FDA and other necessary regulatory approvals is lengthy, expensive and uncertain. We may fail to obtain the necessary approvals to continue our research and development, which would hinder our ability to manufacture or market any future product.

 The development and commercialization of our product candidates is subject to extensive regulation by the FDA and other regulatory agencies in the United States and abroad, and the failure to receive regulatory approvals for our product candidates would likely have a material and adverse effect on our business and prospects.

 The process of obtaining FDA and other regulatory approvals is expensive, generally takes many years and is subject to numerous risks and uncertainties, particularly with complex and/or novel product candidates such as our product candidates. Changes in regulatory approval policies during the development period, changes in or the enactment of additional statutes or regulations, or changes in regulatory review for each submitted product application, may cause delays in the approval or rejection of an application or may make it easier for our competitors to gain regulatory approval to enter the marketplace. Ultimately, the FDA and other regulatory agencies have substantial discretion in the approval process and may refuse to accept any application or may decide that our product candidate data are insufficient for approval without the submission of additional pre-clinical, clinical or other studies. In addition, varying agency interpretations of the data obtained from pre-clinical and clinical testing could delay, limit or prevent regulatory approval of a product candidate. Any regulatory approval we ultimately obtain may be limited or subject to restrictions or post-approval commitments that render the approved product not commercially viable.

 Any of the following factors, among others, could cause regulatory approval for our product candidates to be delayed, limited or denied:

 • the product candidates require significant clinical testing to demonstrate safety and effectiveness before applications for marketing approval can be filed with the FDA and other regulatory authorities;

 • data obtained from pre-clinical and nonclinical animal testing and clinical trials can be interpreted in different ways, and regulatory authorities may not agree with our respective interpretations or may require us to conduct additional testing;

 • negative or inconclusive results or the occurrence of serious or unexpected adverse events during a clinical trial could cause us to delay or terminate development efforts for a product candidate;

 • FDA and other regulatory authorities may require expansion of the size and scope of the clinical trials; and/or

 • a pandemic, epidemic or outbreak of a contagious disease, such as the global pandemic of the novel coronavirus outbreak, may refocus the FDA and other regulatory authorities to clinical trials that are of the utmost need.

 Any difficulties or failures that we encounter in securing regulatory approval for our product candidates would likely have a substantial adverse impact on our ability to generate product sales and could make any search for a collaborative partner more difficult.

 Research in the field of embryonic stem cells is currently subject to strict government regulations, and our operations could be restricted or outlawed by any legislative or administrative efforts impacting the use of nuclear transfer technology or human embryonic material.

 Significant portions of our business are focused on human cell therapy, which includes the production of human differentiated cells from stem cells and involves human oocytes. Although our focus is on parthenogenetic stem cells derived from unfertilized oocytes, certain aspects of that work may involve the use of embryonic stem cells. Research utilizing embryonic stem cells is controversial, and currently subject to intense scrutiny, particularly in the area of the use of human embryonic material.

 Federal law is not as restrictive regarding the use of federal funds for human embryonic cell research, commonly referred to as hES cell research as it once was. However, federal law does prohibit federal funding for creation of parthenogenetic stem cells. Our operations may also be restricted by future legislative or administrative efforts by politicians or groups opposed to the development of hES cell technology, parthenogenetic cell technology or nuclear transfer technology. Further, future legislative or administrative restrictions could, directly or indirectly, delay, limit or prevent the use of hES technology, parthenogenetic technology, or nuclear transfer technology, the use of human embryonic material, or the sale, manufacture or use of products or services derived from nuclear transfer technology or hES or parthenogenetic technology.

 We may be unsuccessful in our efforts to comply with applicable federal, state and international laws and regulations, which could result in loss of licensure, certification or accreditation or other government enforcement actions or impact our ability to secure regulatory approval of our product candidates.

 Although we seek to conduct our business in compliance with applicable governmental healthcare laws and regulations, these laws and regulations are exceedingly complex and often subject to varying interpretations. The cell therapy industry is the topic of significant government interest, and thus the laws and regulations applicable to our business are subject to frequent change and/or reinterpretation. As such, there can be no assurance that we will be able, or will have the resources, to maintain compliance with all such healthcare laws and regulations. Failure to comply with such healthcare laws and regulations, as well as the costs associated with such compliance or with enforcement of such healthcare laws and regulations, may have a material adverse effect on our operations or may require restructuring of our operations or impair our ability to operate profitably.

 Our manufacture of certain cellular therapy products triggers additional FDA requirements applicable to hESCs which are regulated as a drug, biological product, or medical device. FDA's GMP regulations govern the manufacture, processing, packaging and holding of cell therapy products regulated as drugs. FDA's Quality System Regulation, or QSR, similarly governs the manufacture, processing, packaging and holding of cell therapy products regulated as medical devices. We must comply with GMP or QSR requirements including quality control, quality assurance and the maintenance of records and documentation for certain products. We may be unable to comply with these GMP or QSR requirements and with other FDA, state and foreign regulatory requirements. These requirements may change over time and we or third-party manufacturers may be unable to comply with the revised requirements.

 We will continue to be subject to extensive FDA regulation following any product approvals, and if we fail to comply with these regulations, we may suffer a significant setback in our business.

 Even if we are successful in obtaining regulatory approval of our product candidates, we will continue to be subject to the requirements of and review by, the FDA and comparable regulatory authorities in the areas of manufacturing processes, post-approval clinical data, adverse event reporting, labeling, advertising, and promotional activities, among other things. In addition, any marketing approval we receive may be limited in terms of the approved product indication or require costly post-marketing testing and surveillance. Discovery after approval of previously unknown problems with a product, manufacturer or manufacturing process, or a failure to comply with regulatory requirements, may result in actions such as:

 • warning letters or other actions requiring changes in product manufacturing processes or restrictions on product marketing or distribution;

 • product recalls or seizures or the temporary or permanent withdrawal of a product from the market; and

 • fines, restitution or disgorgement of profits or revenue, the imposition of civil penalties or criminal prosecution.

 The occurrence of any of these actions would likely cause a material adverse effect on our business, financial condition and results of operations.

 Health care companies have been the subjects of federal and state investigations, and we could become subject to investigations in the future.

 Both federal and state government agencies have heightened civil and criminal enforcement efforts. There are numerous ongoing investigations of health care companies, as well as their executives and managers. In addition, amendments to the Federal False Claims Act, have made it easier for private parties to bring "qui tam" (whistleblower) lawsuits against companies under which the whistleblower may be entitled to receive a percentage of any money paid to the government. The Federal False Claims Act provides, in part, that an action can be brought against any person or entity that has knowingly presented, or caused to be presented, a false or fraudulent request for payment from the federal government, or who has made a false statement or used a false record to get a claim approved. The government has taken the position that claims presented in violation of the federal anti-kickback law, Stark Law or other healthcare-related laws, including laws enforced by the FDA, may be considered a violation of the Federal False Claims Act. Penalties include substantial fines for each false claim, plus three times the amount of damages that the federal government sustained because of the act of that person or entity and/or exclusion from the Medicare program. In addition, a majority of states have adopted similar state whistleblower and false claims provision. Any future investigations of our business or executives could cause us to incur substantial costs, and result in significant liabilities or penalties, as well as damage to our reputation.

 Restrictions on the use of human stem cells, and the ethical, legal and social implications of that research, could prevent us from developing or gaining acceptance for commercially viable products in these areas.

 Although our stem cells are derived from unfertilized human eggs through a process called "parthenogenesis" that can produce cells suitable for therapy but are believed to be incapable of producing a human being, such cells are nevertheless often incorrectly referred to as "embryonic" stem cells. Because the use of human embryonic stem cells gives rise to ethical, legal and social issues regarding the appropriate use of these cells, our research related to human parthenogenetic stem cells could become the subject of adverse commentary or publicity and some political and religious groups may still raise opposition to our technology and practices. In addition, many research institutions, including some of our scientific collaborators, have adopted policies regarding the ethical use of human embryonic tissue, which, if applied to our procedures, may have the effect of limiting the scope of research conducted using our stem cells, thereby impairing our ability to conduct research in this field. In some states, use of embryos as a source of stem cells is prohibited.

 To the extent we utilize governmental grants in the future, the governmental entities involved may retain certain rights in technology that we develop using such grant money and we may lose the revenues from such technology if we do not commercialize and utilize the technology pursuant to established government guidelines.

 Certain of our licensors' research have been or are being funded in part by government grants. Our research may also be government-funded in the future. In connection with certain grants, the governmental entity involved retains various rights in the technology developed with the grant. These rights could restrict our ability to fully capitalize upon the value of this research by reducing total revenues that might otherwise be available since such governmental rights may give the government the right to practice the invention without payment of royalties if we do not comply with applicable requirements.

 We rely on parthenogenesis, cell differentiation and other stem cell technologies that we may not be able to successfully develop, which may prevent us from generating revenues, operating profitably or providing investors any return on their investment.

 We have concentrated our research on our parthenogenesis, cell differentiation and stem cell technologies, and our ability to operate profitably will depend on being able to successfully implement or develop these technologies for human applications. These are emerging technologies with, as yet, limited human applications. We cannot guarantee that we will be able to successfully implement or develop our nuclear transfer, parthenogenesis, cell differentiation and other stem cell technologies or that these technologies will result in products or services with any significant commercial utility. We anticipate that the commercial sale of such products or services, and royalty/licensing fees related to our technology, would be an additional source of revenues.

 If we are unable to keep up with rapid technological changes in our field or compete effectively, we will be unable to operate profitably.

 We are engaged in activities in the biotechnology field, which is characterized by extensive research efforts and rapid technological progress. If we fail to anticipate or respond adequately to technological developments, our ability to operate profitably could suffer. Research and discoveries by other biotechnology, agricultural, pharmaceutical, or other companies may render our technologies or potential products or services uneconomical or result in products superior to those we develop. Similarly, any technologies, products or services we develop may not be preferred to any existing or newly developed technologies, products, or services.

 We may not be able to protect our proprietary technology, which could harm our ability to operate profitably.

 The biotechnology, cosmetic, and pharmaceutical industries place considerable importance on obtaining patent and trade secret protection for new technologies, products, and processes. Our success will depend, to a substantial degree, on our ability to obtain and enforce patent protection for our products, preserve any trade secrets and operate without infringing the proprietary rights of others. We cannot assure you that:

 • we will succeed in obtaining any patents, obtain them in a timely manner, or that the breadth or degree of protection that any such patents will protect our interests;

 • the use of our technology will not infringe on the proprietary rights of others;

 • patent applications relating to our potential products or technologies will result in the issuance of any patents or that, if issued, such patents will afford adequate protection to us or will not be challenged, invalidated, or infringed; or

 • patents will not be issued to other parties, which may be infringed by our potential products or technologies.

 We are aware of certain patents that have been granted to others and certain patent applications that have been filed by others with respect to nuclear transfer and other stem cell technologies. The fields in which we operate have been characterized by significant efforts by competitors to establish dominant or blocking patent rights to gain a competitive advantage, and by considerable differences of opinion as to the value and legal legitimacy of competitors' purported patent rights and the technologies they actually utilize in their businesses.

 Considerable research in the areas of stem cells, cell therapeutics and regenerative medicine is being performed in countries outside of the United States, and a number of our competitors are located in those countries. The laws protecting intellectual property in some of those countries may not provide adequate protection to prevent our competitors from misappropriating our intellectual property.

 Our business is highly dependent upon maintaining licenses with respect to key technology.

 Although our primary focus relates to intellectual property we have developed internally, some of the patents we utilize are licensed to us by Astellas Pharma, which has licensed some of these from other parties, including the University of Massachusetts ("UMass"). These licenses are subject to termination under certain circumstances (including, for example, our failure to make minimum royalty payments). The restriction or loss of any of such licenses, or the conversion of such licenses to non-exclusive licenses, could adversely affect our operations and/or enhance the prospects of our competitors.

 Although our licenses with Astellas allow us to cure any defaults under the underlying licenses to them and to take over the patents and patents pending in the event of default by Astellas, the cost of such remedies could be significant, and we might be unable to adequately maintain these patent positions. If so, such inability could have a material adverse effect on our business. Some of these licenses also contain restrictions (e.g., limitations on our ability to grant sublicenses) that could materially interfere with our ability to generate revenue through collaborative relationships or other transactions that involve the licensing or sale to third parties of important and valuable technologies that we have, for strategic reasons, elected not to pursue directly. In the future we may require further licenses to complete and/or commercialize our proposed products. We may not be able to acquire any such licenses on a commercially viable basis.

 We have experienced in the past and may experience in the future network or system failures, or service interruptions, including cybersecurity attacks, or other technology risks. Our inability to protect our systems and data against such risks could harm our business and reputation.

 Our ability to provide uninterrupted and high levels of service depends upon the performance of our internal network, systems, and related infrastructure, and those of our third-party vendors. Any significant interruptions in, or degradation of, the quality of the services, including infrastructure storage and support, that these third parties provide to us could severely harm our business and reputation and lead to the loss of customers and revenue. Our internal network, systems, and related infrastructure, in addition to the networks, systems, and related infrastructure of our third-party technology vendors, may be vulnerable to computer viruses and other malware that infiltrate such systems and networks, as well as physical or electronic security breaches, natural disasters, and similar disruptions. They have been and may continue to be the target of attempts to identify and exploit network and system vulnerabilities, penetrate or bypass security measures in order to interrupt or degrade the quality of the services we receive or provide, or otherwise gain unauthorized access to our networks and systems or those of our third-party vendors. These vulnerabilities or other attempts at access may result from, or be caused by, human error or technology failures, however, they may also be the product of malicious actions by third parties intending to harm our business. The methods that may be used by these third parties to cause interruptions or failures or to obtain unauthorized access to information change frequently, are difficult to detect, evolve rapidly, and are increasingly sophisticated and hard to defend against. Although we have not incurred material losses or liabilities as a result of security breaches or attempted security breaches and continue to invest in security measures, we cannot be certain that our defensive measures, and those employed by our third-party vendors, will be sufficient to defend against all such current and future methods.

 Our careful vetting of third parties to provide technology services and the contractual requirements related to the security that we impose on our third-party vendors who have access to this data may not be sufficient to protect us from network or system failures or service interruptions.

 Any actual or perceived security breach, whether experienced by us or a third-party vendor; the reporting or announcement of such an event, or reports of perceived security vulnerabilities of our systems or the systems of our third-party service providers whether accurate or not; or our failure or perceived failure to respond or remediate an event or make adequate or timely disclosures to the public, regulatory or law enforcement agencies following any such event may be material and lead to harm to our financial condition, business reputation, and prospects of future business due to, among other factors: loss of customer confidence arising from interruptions or outages, delays, failure to meet contractual obligations, and loss of data or public release of confidential data; increase regulatory scrutiny on us; compromise our trade secret and intellectual property; expose us to costly uninsured liabilities such as material fines, penalties, liquidated damages, and overall margin compression due to renegotiation of contracts on less favorable terms or loss of business; liability

 for claims relating to misuse of personal information in violation of contractual obligations or data privacy laws; and potential theft of our intellectual property.

 A security breach could occur and persist for an extended period of time without detection. We expect that any investigation of a security breach could take a substantial amount of time, and during such time we may not necessarily know the extent of the harm or how best to remediate it, and certain errors or actions could be repeated or compounded before they are discovered and remediated, all of which could further increase the costs and consequences of such a breach. Further, detecting and remediating such incidents may require specialized expertise and there can be no assurance that we will be able to retain or hire individuals who possess, or otherwise internally develop, such expertise. Our remediation efforts therefore may not be successful. The inability to implement, maintain, and upgrade adequate safeguards could have a material and adverse impact on our business, financial condition, and results of operations. Moreover, there could be public announcements regarding any data security-related incidents and any steps we take to respond to or remediate such incidents.

 The occurrence of any such failure may also subject us to costly lawsuits, claims for contractual indemnities, as well as divert valuable management, research and development, information technology, and marketing resources toward addressing these issues and delay our ability to achieve our strategic initiatives. In addition, we gather, as permitted by law, non-public, personally identifiable financial information from customers, such as names, addresses, telephone numbers, bank and credit card account numbers and financial transaction information, and the compromise of such data, which may subject us to fines and other related costs of remediation.

 Certain of our technology may not be subject to protection through patents, which leaves us vulnerable to theft of our technology.

 Certain parts of our know-how and technology are not patentable or are trade secrets. To protect our proprietary position in such know-how and technology, we intend to require all employees, consultants, advisors, and collaborators to enter into confidentiality and invention ownership agreements with us. These agreements may not provide meaningful protection for our trade secrets, know-how or other proprietary information in the event of any unauthorized use or disclosure. Further, in the absence of patent protection, competitors who independently develop substantially equivalent technology may harm our business.

 We depend on our collaborators to help us develop and test our proposed products, and our ability to develop and commercialize products may be impaired or delayed if collaborations are unsuccessful.

 Our strategy for the development, clinical testing and commercialization of our proposed products requires that we enter into collaborations with corporate partners, licensors, licensees and others. We are dependent upon the subsequent success of these other parties in performing their respective responsibilities and the continued cooperation of our partners. Our collaborators may not cooperate with us or perform their obligations under our agreements with them. We cannot control the amount and timing of our collaborators' resources that will be devoted to our research and development activities related to our collaborative agreements with them. Our collaborators may choose to pursue existing or alternative technologies in preference to those being developed in collaboration with us.

 Under agreements with collaborators, we may rely significantly on such collaborators to, among other things:

 • design and conduct advanced clinical trials in the event that we reach clinical trials;

 • fund research and development activities with us;

 • pay us fees upon the achievement of milestones; and

 • market with us any commercial products that result from our collaborations.

 The development and commercialization of potential products will be delayed if collaborators fail to conduct these activities in a timely manner, or at all. In addition, our collaborators could terminate their agreements with us, and we may not receive any development or milestone payments. If we do not achieve milestones set forth in the agreements, or if our collaborators breach or terminate their collaborative agreements with us, our business may be materially harmed.

 Contractual arrangements with licensors or collaborators may require us to pay royalties or make other payments related to the development of a product candidate, which would adversely affect the level of our future revenues and profits.

 Even if we obtain all applicable regulatory approvals and successfully commercialize one or more of our cell therapy candidates, contractual arrangements between us and a licensor, collaborator or other third party in connection with the respective product may require that we make royalty or other payments to the respective third party, and as a result we would not receive all of the revenue derived from commercial sales of such product.

 Our reliance on the activities of our non-employee consultants, research institutions, and scientific contractors, whose activities are not wholly within our control, may lead to delays in development of our proposed products.

 We rely extensively upon and have relationships with scientific consultants at academic and other institutions, some of whom conduct research at our request, and other consultants with expertise in clinical development strategy or other matters. These consultants are not our employees and may have commitments to, or consulting or advisory contracts with, other entities that may limit their availability to us. We have limited control over the activities of these consultants and, except as otherwise required by our collaboration and consulting agreements to the extent they exist, can expect only limited amounts of their time to be dedicated to our activities. These research facilities may have commitments to other commercial and non-commercial entities. We have limited control over the operations of these laboratories and can expect only limited amounts of time to be dedicated to our research goals.

 We may not be able to obtain third party patient reimbursement or favorable product pricing, which would reduce our ability to operate profitably.

 Our ability to successfully commercialize certain of our proposed products in the human therapeutic field may depend to a significant degree on patient reimbursement of the costs of such products and related treatments at acceptable levels from government authorities, private health insurers and other organizations, such as health maintenance organizations. Reimbursement in the United States or foreign countries may not be available for any products we may develop, and, if available, may be decreased in the future. Also, reimbursement amounts may reduce the demand for, or the price of, our products with a consequent harm to our business. We cannot predict what additional regulation or legislation relating to the health care industry or third-party coverage and reimbursement may be enacted in the future or what effect such regulation or legislation may have on our business. If additional regulations are overly onerous or expensive, or if health care related legislation makes our business more expensive or burdensome than originally anticipated, we may be forced to significantly downsize our business plans or completely abandon our business model.

 Our products may be expensive to manufacture, and they may not be profitable if we are unable to control the costs to manufacture them.

 Our products may be significantly more expensive to manufacture than other therapeutic products currently on the market today. We hope to substantially reduce manufacturing costs through process improvements, development of new methods, increases in manufacturing scale and outsourcing to experienced manufacturers. If we are not able to make these, or other improvements, and depending on the pricing of the product, our profit margins may be significantly less than that of other therapeutic products on the market today. In addition, we may not be able to charge a high enough price for any cell therapy product we develop, even if they are safe and effective, to make a profit. If we are unable to realize significant profits from our potential product candidates, our business would be materially harmed.

 We presently lack sufficient manufacturing capabilities to produce our therapeutic product candidates at commercial scale quantities and do not have an alternate manufacturing supply, which could negatively impact our ability to meet any future demand for the product.

 We expect that we would need to significantly expand our manufacturing capabilities to meet potential demand for our therapeutic product candidates, if approved. Such expansion would require additional regulatory approvals. Even if we increase our manufacturing capabilities, it is possible that we may still lack sufficient capacity to meet demand.

 We do not presently have any alternate supply for our products. If our facilities where our products are currently being manufactured or equipment were significantly damaged or destroyed, or if there were other disruptions, delays or difficulties affecting manufacturing capacity, including if such facilities are deemed not in compliance with current Good Manufacturing Practice ("GMP") requirements, future clinical studies and commercial production for our products would likely be significantly disrupted and delayed. It would be both time consuming and expensive to replace this capacity with third parties, particularly since any new facility would need to comply with the regulatory requirements.

 Ultimately, if we are unable to supply our products to meet commercial demand, whether because of processing constraints or other disruptions, delays or difficulties that we experience, our production costs could dramatically increase, and sales of the product and its long-term commercial prospects could be significantly damaged.

 To be successful, our proposed products must be accepted by the health care community, which can be very slow to adopt or unreceptive to new technologies and products.

 Our proposed products and those developed by our collaborative partners, if approved for marketing, may not achieve market acceptance since hospitals, physicians, patients or the medical community in general may decide not to accept and utilize these products.

 The products that we are attempting to develop represent substantial departures from established treatment methods and will compete with a number of more conventional therapies manufactured and marketed by major pharmaceutical companies. The degree of market acceptance of any of our developed products will depend on a number of factors, including:

 • our establishment and demonstration to the medical community of the clinical efficacy and safety of our proposed products;

 • our ability to create products that are superior to alternatives currently on the market;

 • our ability to establish in the medical community the potential advantage of our treatments over alternative treatment methods; and

 • reimbursement policies of government and third-party payers.

 If the healthcare community does not accept our products for any of the foregoing reasons, or for any other reason, our business would be materially harmed.

 Our business is based on novel technologies that are inherently expensive, risky and may not be understood by or accepted in the marketplace, which could adversely affect our future value.

 The clinical development, commercialization and marketing of cell and tissue-based therapies are at an early-stage, substantially research-oriented, and financially speculative. To date, very few companies have been successful in their efforts to develop and commercialize a stem cell product. In general, stem cell products may be susceptible to various risks, including undesirable and unintended side effects, unintended immune system responses, inadequate therapeutic efficacy, or other characteristics that may prevent or limit their approval or commercial use. Furthermore, the number of people who may use cell or tissue-based therapies is difficult to forecast with accuracy. Our future success is dependent on the establishment of a significant market for cell- and tissue-based therapies and our ability to capture a share of this market with our product candidates.

 Our development efforts with our therapeutic product candidates are susceptible to the same risks of failure inherent in the development and commercialization of therapeutic products based on new technologies. The novel nature of cellular therapeutics creates significant challenges in the areas of product development and optimization, manufacturing, government regulation, third-party reimbursement and market acceptance. For example, the United States FDA has relatively limited experience regulating therapies based on cells, and there are few approved treatments utilizing cell therapy.

 During the year ended December 31, 2023, we derived approximately 46% of our revenues from one customer.

 During the year ended December 31, 2023, one customer accounted for 46% of our consolidated revenues. To the extent that this significant customer reduces or delays its purchases from us or terminate its relationship with us, our revenues would decline significantly, and our financial condition and results of operations would suffer substantially.

 We depend on key personnel for our continued operations and future success, and a loss of certain key personnel could significantly hinder our ability to move forward with our business plan.

 Because of the specialized nature of our business, we are highly dependent on our ability to identify, hire, train, and retain highly qualified scientific and technical personnel for the research and development activities we conduct or sponsor. The loss of one or more key executive officers, or scientific officers, would be significantly detrimental to us. In addition, recruiting and retaining qualified scientific personnel to perform research and development work is critical to our success. Our anticipated growth and expansion into areas and activities requiring additional expertise, such as clinical testing, regulatory compliance, manufacturing and marketing, will require the addition of new management personnel and the development of additional expertise by existing management personnel. There is intense competition for qualified personnel in the areas of our present and planned activities. Accordingly, we may not be able to continue to attract and retain the qualified personnel, which would adversely affect the development of our business.

 We may not have sufficient product liability insurance, which may leave us vulnerable to future claims we will be unable to satisfy.

 The testing, manufacturing, marketing, and sale of human therapeutic products entail an inherent risk of product liability claims. We currently have a limited amount of product liability insurance, which may not be adequate to meet potential product liability claims. In the event we are forced to expend significant funds on defending product liability actions, and in the event those funds come from operating capital, we will be required to reduce our business activities, which could lead to significant losses. Adequate insurance coverage may not be available in the future on acceptable terms, if at all. If available, we may not be able to maintain any such insurance at sufficient levels of coverage and any such insurance may not provide adequate protection against potential liabilities. Whether or not

 a product liability insurance policy is obtained or maintained in the future, any product liability claim could harm our business or financial condition.

 Many of the key materials in our products and packaging, and manufacturing services for certain of our other products, are obtained from a single or limited number of suppliers. Thus, we are at risk of shortages, price increases, tariffs, changes, delay, or discontinuation of key materials and manufacturing services, which could disrupt and materially and adversely affect our business.

 Many of the key materials used to manufacture or package our LCT products come from limited or single sources of supply. In addition, in some cases primarily for our LSC products, we rely only on one manufacturer or a limited number of contract manufacturers to fill and finish, test, and package our products. In general, our contract manufacturers fabricate or procure certain materials and packaging on our behalf, subject to certain approved procedures or supplier lists. We do not have firm commitments from many of these suppliers and manufacturers to provide all materials and services, or to provide them in quantities and on timelines that we may require.

 Due to our reliance on the key materials provided by suppliers and services provided by contract manufacturers, we are subject to the risk of shortages and long lead times or other disruptions in the supply of certain materials or services. For example, our ability to ship LCT products has recently been adversely affected by shortages in plastic resin that is used to make the packaging containers for those products. Our ongoing efforts to identify alternative suppliers (for many of the single-sourced or limited-sourced materials used in our products) and alternative contract manufacturers (for the assembly of our LSC products) may not be successful. We are subject to the risk that our suppliers may discontinue or modify the materials they provide to us, or that the materials may cease to be available on commercially reasonable terms, or at all. We have in the past experienced, and may in the future experience, materials shortages or delays or other problems in product assembly, and the availability of these materials or services may be difficult to predict. For example, our suppliers or manufacturers may experience temporary or permanent disruptions in their manufacturing operations due to equipment breakdowns, labor strikes or shortages, natural disasters, the occurrence of a contagious disease or illness, such as the novel coronavirus outbreak, component or material shortages, cost increases, acquisitions, insolvency, bankruptcy, business shutdowns, trade restrictions, changes in legal or regulatory requirements, or other similar problems.

 Additionally, various sources of supply-chain risk, including strikes or shutdowns at delivery ports or loss of or damage to our products while they are in transit or storage, intellectual property theft, losses due to tampering, third-party vendor issues with quality or sourcing control, failure by our suppliers to comply with applicable laws and regulation, potential tariffs or other trade restrictions, or other similar problems, could limit or delay the supply of our products or harm our reputation. In the event of a shortage or supply interruption from suppliers or contract manufacturers, we may not be able to develop alternate sources quickly, cost-effectively, or at all. Any interruption or delay in material supply or manufacturing, any increases in material or manufacturing costs, or the inability to obtain these materials or services from alternate sources at acceptable prices and within a reasonable amount of time, would harm our ability to provide our products on a timely basis. This could materially and adversely affect our business.

 Economic uncertainties and unfavorable economic conditions could adversely affect our business, financial condition, results of operations or our access to capital.

 Our business, financial condition, results of operations or prospects could be adversely affected by general economic conditions and uncertainties, including in the financial markets. Negative economic conditions, both in the United States and abroad, including the effects of changes in economic growth and expectations, labor shortages, supply chain disruptions, inflationary pressures, financial and credit market fluctuations, international trade relations and/or the imposition of trade tariffs, political turmoil, natural catastrophes, regional or global outbreaks of contagious diseases, such as the novel coronavirus pandemic, terrorist attacks and warfare (such as the Russia – Ukraine conflict and any resulting sanctions imposed), as well as related governmental or regulatory responses, could cause a decrease or deferral in spending by our customers and otherwise negatively affect our business. A severe or prolonged economic downturn or economic uncertainties from these or other factors could also adversely affect our ability to raise additional capital when needed on acceptable terms, if at all. A weak or declining economy could also strain our suppliers, possibly resulting in supply disruptions. Any such disruptions may also magnify the impact of other risks described in this Annual Report on Form 10-K.

 Our business is subject to risks arising from epidemic diseases or other public health emergencies.

 A pandemic, including COVID-19 or other public health epidemic, poses the risk that we or our employees, contractors, customers, suppliers, third party shipping carriers, government and other partners may be prevented from or limited in their ability to conduct business activities for an indefinite period of time, including due to the spread of the disease within these groups or due to shutdowns that may be requested or mandated by governmental authorities. The occurrence of any pandemic or other public health emergency could have a material adverse effect on our business, financial condition and results of operations.

 Risks Related to the Securities Markets and Our Capital Structure

 Stock prices for biotechnology companies have historically tended to be very volatile.

 Stock prices and trading volumes for many biotechnology companies fluctuate widely for a number of reasons, including but not limited to the following factors, some of which may be unrelated to their businesses or results of operations:

 • clinical trial results;

 • the amount of cash resources and such company's ability to obtain additional funding;

 • announcements of research activities, business developments, technological innovations or new products by competitors;

 • entering into or terminating strategic relationships;

 • changes in government regulation;

 • disputes concerning patents or proprietary rights;

 • changes in revenues or expense levels;

 • public concern regarding the safety, efficacy or other aspects of the products or methodologies being developed;

 • development of major public health concerns, such as the novel coronavirus outbreak, or other pandemics arising globally, and its impact to the financial market;

 • reports by securities analysts;

 • activities of various interest groups or organizations;

 • media coverage; and

 • status of the investment markets.

 This market volatility, as well as general domestic or international economic, market and political conditions, could materially and adversely affect the market price of our common stock.

 Two of our executive officers and directors can significantly influence our direction and policies, and their interests may be adverse to the interests of our other stockholders.

 As of December 31, 2023, Dr. Andrey Semechkin, Chief Executive Officer and Co-Chairman of the Board of Directors, and Dr. Russell Kern, Executive Vice President and Chief Scientific Officer and a director, beneficially own approximately 63% of our outstanding shares of common stock, including shares issuable upon conversion of the outstanding shares of our Series D, Series G, and Series I-2 Preferred Stock and shares issuable upon exercise of options that they hold and that are exercisable within 60 days of December 31, 2023. As a result of their holdings and the rights, preferences, and privileges of those series of preferred stock, Dr. Andrey Semechkin and Dr. Russell Kern may appoint and remove two of our four directors and propose candidates for nomination of up to two additional directors, and therefore will be able to significantly influence the election of our Board of Directors. They may also prevent corporate transactions (such as a merger, consolidation, a sale of all or substantially all of our assets or a financing transaction) that may be favorable from the standpoint of our other stockholders, or they may cause a transaction that our other stockholders may view as unfavorable.

 The rights of holders of our common stock are subordinate to significant rights, preferences and privileges of our existing five series of preferred stock, and to any additional series of preferred stock created in the future.

 Under the authority granted by our Certificate of Incorporation, our Board of Directors has established four separate series of outstanding preferred stock, Series B, Series D, Series G and Series I-2 Preferred Stock, which have various rights and preferences senior to the shares of common stock. Shares of some series of our existing preferred stock are also entitled to enhanced voting rights and liquidation preferences. As a result of the various voting rights, the holders of our existing preferred stock may be able to block the proposed approval of various corporate actions, which could prevent us from achieving strategic or other goals dependent on such actions. As a result of the liquidation preferences, in the event that we voluntarily or involuntary liquidate, dissolve or windup our affairs (including as a result of a merger), the holders of our preferred stock would be entitled to receive stated amounts per share, including any accrued and unpaid dividends, before any distribution of assets or merger consideration is made to holders of our common stock. Additionally, these shares of preferred stock may be converted, at the option of the holders, into common stock at rates that may be adjusted, for the benefit of holders of preferred stock, if we sell equity securities below the then existing conversion prices. Any such

 adjustments would compound the potential dilution suffered by holders of common stock if we issue additional securities at prices below the current conversion prices (ranging from $0.12 to $9.69 per share as of December 31, 2023). Additionally, subject to the consent of the holders of our existing preferred stock, our Board of Directors has the power to issue additional series of preferred stock and to designate, as it deems appropriate (subject to the rights of the holders of the current series of preferred stock), the special dividend, liquidation or voting rights of the shares of those additional series. The creation and designation of any new series of preferred stock could adversely affect the voting power, dividend, liquidation, and other rights of holders of our common stock and, possibly, any other class or series of stock that is then in existence.

 The market price for our common stock has been and may continue to be particularly volatile given our status as a relatively unknown company with a limited operating history and lack of profits, which could lead to wide fluctuations in our share price. The price at which stockholders purchase shares of our common stock may not be indicative of the price of our common stock that will prevail in the trading market.

 The market for our common stock may be characterized by significant price volatility when compared to seasoned issuers, and we expect that our stock price could continue to be more volatile than a seasoned issuer for the indefinite future. The potential volatility in our share price is attributable to a number of factors. First, there has been limited trading in our common stock. As a consequence of this lack of liquidity, any future trading of shares by our stockholders may disproportionately influence the price of those shares in either direction. Second, we are a speculative or "risky" investment due to our limited operating history and lack of profits to date, and uncertainty of future market acceptance for our potential products. As a consequence of this enhanced risk, more risk averse investors may, under the fear of losing all or most of their investment in the event of negative news or lack of progress, be more inclined to sell their shares on the market more quickly and at greater discounts than would be the case with the stock of a seasoned issuer. Many of these factors will be beyond our control and may decrease the market price of our common stock, regardless of our operating performance. We cannot make any predictions or projections as to what the prevailing market price for our common stock will be at any time or as to what effect that the sale of shares or the availability of shares for sale at any time will have on the prevailing market price.

 In addition, the market price of our common stock could be subject to wide fluctuations in response to:

 • quarterly variations in our revenues and operating expenses;

 • announcements of new products or services by us;

 • fluctuations in interest rates;

 • significant sales of our common stock;

 • the operating and stock price performance of other companies that investors may deem comparable to us; and

 • news reports relating to trends in our markets or general economic conditions.

 Certain provisions of our Certificate of Incorporation and Delaware law may make it more difficult for a third party to affect a change-in-control.

 Our Certificate of Incorporation authorizes the Board of Directors to issue up to 20,000,000 shares of preferred stock and our Board of Directors has created and issued shares of four series of preferred stock that remain outstanding, Series B, Series D and Series I-2 Preferred Stock. The terms of various series of Preferred Stock include, among other things, voting rights on particular matters (for example, with respect to the Series D Preferred Stock, restricting our ability to undergo a change in control or merge with, or sell assets to, a third-party), preferences as to dividends and liquidation, and conversion rights. These preferred stock rights diminish the rights of holders of our common stock, and therefore could reduce the value of such common stock. In addition, as long as shares of our Series B, Series D and Series G Preferred Stock remain outstanding, or if our Board creates and issues additional shares of preferred stock in the future with rights that restrict our ability to merge with, or sell assets to, a third party, it could make it more difficult, delay, discourage, prevent or make it more costly to acquire the Company or affect a change-in-control.

 The application of the "penny stock" rules to our common stock could limit the trading and liquidity of our common stock, adversely affect the market price of our common stock and increase stockholder transaction costs to sell those shares.

 While we are currently exempt from the "penny stock" rules, as long as the trading price of our common stock is below $5.00 per share, the open market trading of our common stock would be subject to the "penny stock" rules, if we otherwise do not continue to qualify for an exemption from the "penny stock" definition. The "penny stock" rules impose additional sales practice requirements on certain broker-dealers who sell securities to persons other than established customers and accredited investors (generally those with assets in excess of $1 million or annual income exceeding $200 thousand or $300 thousand together with their spouse). These regulations, if they apply, require the delivery, prior to any transaction involving a penny stock, of a disclosure schedule explaining the

 penny stock market and the associated risks. Under these regulations, certain brokers who recommend such securities to persons other than established customers or certain accredited investors must make a special written suitability determination regarding such a purchaser and receive such purchaser's written agreement to a transaction prior to sale. These regulations may have the effect of limiting the trading activity of our common stock, reducing the liquidity of an investment in our common stock and increasing the transaction costs for sales and purchases of our common stock as compared to other securities.

 The sale or issuance of a substantial number of shares may adversely affect the market price for our common stock.

 The future sale of a substantial number of shares of our common stock in the public market, or the perception that such sales could occur, could significantly and negatively affect the market price for our common stock. We expect that we will likely issue a substantial number of shares of our capital stock in financing transactions in order to fund our operations and the growth of our business. Under these arrangements, we may agree to register the shares for resale soon after their issuance. We may also continue to pay for certain goods and services with equity, which would dilute our current stockholders. Also, sales of the shares issued in this manner could negatively affect the market price of our stock.

 Our ability to utilize our net operating loss carryforwards and certain other tax attributes may be limited.

 We have incurred substantial tax losses during our history. Subject to various limitations, we may carryforward unused taxable losses, including those generated in the future, and other available credits to offset any future taxable income until the unused losses or credits expire. Federal and state tax laws impose restrictions on the utilization of net operating loss ("NOL") and tax credit carryforwards in the event of an "ownership change" as defined by Section 382 of the Internal Revenue Code of 1986, as amended ("Section 382"). Generally, an ownership change occurs if the percentage of the value of the stock that is owned by one or more direct or indirect "five percent shareholders" increases by more than 50 percentage points over their lowest ownership percentage at any time during the applicable testing period (typically, three years). Under Section 382 and Section 383, if a corporation undergoes an "ownership change," the corporation's ability to use its pre-change NOL carryforwards and other pre-change tax attributes to offset its post change income may be limited. During 2023 an analysis was completed to determine whether any ownership change has occurred, as defined by IRC Sections 382 and 383, and it was determined that significant ownership changes occurred in January 2009 and November 2015. As a result of the ownership changes, under IRC Sections 382 and 383, the net operating loss and tax credit carryforwards that were generated in years prior to 2015 have been significantly limited and a substantial unused amount will expire. During 2023 an analysis was completed to determine whether any ownership change has occurred, as defined by IRC Sections 382 and 383, and it was determined that significant ownership changes occurred in January 2009 and November 2015. As a result of the ownership changes, under IRC Sections 382 and 383, the net operating loss and tax credit carryforwards that were generated in years prior to 2015 have been significantly limited and a substantial unused amount will expire. Future changes in our stock ownership, which may be outside of our control, may trigger an "ownership change." In addition, future equity offerings or acquisitions that have equity as a component of the purchase price could result in an "ownership change." If an "ownership change" has occurred or does occur in the future, our ability to utilize our NOL carryforwards or other tax attributes may be limited, which could result in an increased future tax liability to us.

 Limitations on director and officer liability and indemnification of our officers and directors by us may discourage stockholders from bringing suit against a director.

 Our certificate of incorporation and bylaws provide, with certain exceptions as permitted by governing state law, that a director or officer shall not be personally liable to us or our stockholders for breach of fiduciary duty as a director, except for acts or omissions which involve intentional misconduct, fraud or knowing violation of law, or unlawful payments of dividends. These provisions may discourage stockholders from bringing suit against a director for breach of fiduciary duty and may reduce the likelihood of derivative litigation brought by stockholders on our behalf against a director. In addition, our certificate of incorporation and bylaws may provide for mandatory indemnification of directors and officers to the fullest extent permitted by governing state law.

 Compliance with the rules established by the SEC pursuant to Section 404 of the Sarbanes-Oxley Act of 2002 is complex. Failure to comply in a timely manner could adversely affect investor confidence and our stock price.

 Rules adopted by the SEC pursuant to Section 404 of the Sarbanes-Oxley Act of 2002 require us to perform an annual assessment of our internal controls over financial reporting and certify the effectiveness of those controls. The standards that must be met for management to assess the internal controls over financial reporting now in effect are complex, costly and require significant documentation, testing and possible remediation to meet the detailed standards. We may encounter problems or delays in completing activities necessary to make an assessment of our internal controls over financial reporting. If we cannot perform the assessment or certify that our internal controls over financial reporting are effective investor confidence and share value may be negatively impacted.

 ITEM 1B. UNRESOLVED STAFF COMMENTS.

 None.

 ITEM 1C. CYBERSECURITY.

 We continue to evaluate and improve the capabilities of our people, processes, and technologies to address our cybersecurity risks. Our cybersecurity risks, and the controls designed to mitigate those risks, are integrated into our overall risk management governance, and are reviewed by our Board of Directors annually.

 Risk Management and Strategy

 As of December 31, 2023, we have implemented thorough cybersecurity and data protection policies and procedures. Risks from cybersecurity threats are often assessed as a part of our broader risk management activities and as a fundamental component of our internal control system. Our employees and contractors are required to complete annual cybersecurity awareness trainings, including specific topics related to browser safety, data protection, and email fraud. We have competent employees and consultants with a firm understanding of cybersecurity related to our industry. We invest in advanced technologies for continuous cybersecurity monitoring across our information technology environment which are designed to prevent, detect, and minimize cybersecurity attacks, as well as notify management of such attacks in a timely manner.

 Our Information Technology General Controls are firmly established based on recognized industry standards and addresses matters such as risk management, data backup, and disaster recovery. We also engage an outsourced information technology consultant to actively monitor and mitigate security threats, as well as identify vulnerabilities and respond to all cybersecurity incidents affecting us, including timely communication of significant security incidents to senior business leadership and our Board of Directors.

 Governance

 Our Board of Directors is responsible for overseeing our cyber security risk management and strategy. Our senior leadership, including our Chief Executive Officer and Principal Financial Officer, frequently meets with and provides informative updates to our Board of Directors regarding our cybersecurity risks and activities, including any recent cyber security incidents and related responses, cybersecurity systems testing, and activities of third parties.

 Our Information Security Team is outsourced to two separate service providers, one of which oversees all aspects of IT and facilities to ensure the Company's infrastructure, including intellectual property, is protected. Specifically, this service provider is tasked with communicating any issues or updates necessary and possesses the appropriate level of expertise to assess and manage the Company's cyber security risk. This service provider reports to our Principal Financial Officer, who oversees prevention, detection, mitigation, and remediation efforts through regular communication and reporting channels within our organization and with service providers.

 Cybersecurity Threat Disclosure

 While we have not, as of the date of this Annual Report, experienced a cybersecurity threat or incident that has had a material impact on our business or operations, there can be no guarantee that we will not experience an incident that results in a material impact to our business or operations in the future. In addition, cybersecurity threats are constantly evolving and increasing in sophistication, which increases the difficulty of successfully defending against them or implementing adequate preventative measures. Refer to Part I, Item 1A. Risk Factors for further discussion of cybersecurity risks.

 ITEM 2. PROPERTIES

 In October 2021, we entered into a joint lease agreement with S Real Estate Holding, LLC (an affiliate of our Executive Vice President and Chief Scientific Officer) for the purpose of establishing a new corporate headquarters that combines the Company's research facility and corporate offices, including corporate, R&D, and manufacturing operations, in San Diego, California. In connection with entering into the joint lease agreement, we entered into a co-tenant agreement with S Real Estate Holdings, LLC, to share costs related to the leased premises. In addition to base rent, the Company and S Real Estate Holdings, LLC, are responsible for certain costs and expenses, including insurance, maintenance costs, taxes and operating expenses. The lease covers approximately 7,300 square feet, of which portions of the facility are designated for use by the Company, S Real Estate Holdings, LLC, or shared. The lease for this facility expires in December 2026. At commencement, base rent due under the lease was approximately $11 thousand and increases approximately 3.5% per annum over the lease term. Pursuant to the co-tenant agreement with S Real Estate Holdings, LLC, we are liable for 40% of total base rent and variable lease charges due under the joint lease agreement.

 We also lease supplemental office space in a building adjacent to our new corporate headquarter from the same landlord. The supplemental office lease expires in December 2026 and is not subject to the co-tenant agreement with S Real Estate Holdings, LLC. The new corporate headquarters lease and supplemental office lease do not contain any options to renew to extend the lease terms.

 In addition, we lease a 13,320 square foot facility in Frederick, Maryland, which is used for laboratory and administrative purposes. The current lease expires in November 2025. As of December 31, 2023, the base rent was approximately $19 thousand per month. The laboratory is used to develop and manufacture our research products and the administration facility is used for sales and marketing, and general administration purposes. The monthly base rent will increase by 3% on each anniversary date of the agreement.

 We believe our existing facilities are adequate to meet our current operational needs, and that suitable alternatives will be available in the future as and when needed on commercially reasonably terms.

 ITEM 3. LEGAL PROCEEDINGS.

 None.

 ITEM 4. MINE SAFETY DISCLOSURES.

 Not applicable.

 ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES.

 Market Information

 As of December 31, 2023, we had 8,004,389 shares of common stock outstanding, and approximately 632 holders of record of our common stock, and we had 5,254,353 shares of preferred stock outstanding, and four holders of record of our preferred stock, with the 5,254,353 shares of preferred stock being convertible into 7,518,830 shares of common stock.

 We trade on the OTC QX is a regulated quotation service that displays real-time quotes, last-sale prices and volume information in over-the-counter equity securities. The OTC QX securities are traded by a community of market makers that enter quotes and trade reports. This market is limited in comparison to an exchange and any prices quoted may not be a reliable indication of the value of our common stock.

 Dividends

 Our Board of Directors determines any payment of dividends. We have never declared or paid cash dividends on our common stock. We do not expect to authorize the payment of cash dividends on our shares of common stock in the foreseeable future. Any future decision with respect to dividends will depend on our future earnings, operations, capital requirements and availability, restrictions in future financing agreements and other business and financial considerations.

 ITEM 6. [RESERVED]

 ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

 The following discussion of our financial condition and results of operations should be read in conjunction with our audited consolidated financial statements and accompanying notes to those consolidated financial statements and other financial information included elsewhere in this Annual Report on Form 10-K. The discussion contains forward-looking statements, such as our plans, expectations and intentions (including those related to clinical trials and business and expense trends), that are based upon current expectations and that involve risks and uncertainties. Our actual results may differ significantly from management's expectations. The factors that could affect these forward-looking statements are in Part I, Item 1A. Risk Factors of this report. This discussion should not be construed to imply that the results discussed herein will necessarily continue into the future, or that any expectations expressed herein will necessarily be indicative of actual operating results in the future. Such discussion represents only the best present assessment by our management.

 Business Overview

 We have generated aggregate product revenues from our two commercial businesses of $7.8 million and $8.2 million for the years ended December 31, 2023 and 2022, respectively. We currently have no revenue generated from our principal operations in therapeutic and clinical product development.

 Our products are based on multi-decade experience with human cell culture and a proprietary type of pluripotent stem cells, human parthenogenetic stem cells ("hpSCs"). Our hpSCs are comparable to human embryonic stem cells ("hESCs") in that they have the potential to be differentiated into many different cells in the human body. However, the derivation of hpSCs does not require the use of fertilized eggs or the destruction of viable human embryos and also offers the potential for the creation of immune-matched cells and tissues that are less likely to be rejected following transplantation. Our collection of hpSCs, known as UniStemCell™, currently consists of 15 stem cell lines. We have facilities and manufacturing protocols that comply with the requirements of Good Manufacturing Practice ("GMP") standards as promulgated by the U.S. Code of Federal Regulations and enforced by the United States Food and Drug Administration ("FDA").

 Market Opportunity and Growth Strategy

 Therapeutic Market – Clinical Applications of hpSCs for Disease Treatments

 We believe that the most promising potential clinical applications of our technology are Parkinson's disease ("PD"), traumatic brain injury ("TBI"), and stroke. Using our proprietary technologies and know-how, we are creating neural stem cells from hpSCs as a potential treatment of PD, TBI, and stroke.

 PD: Our most advanced project is the neural stem cell program for the treatment of Parkinson's disease. In 2013, we published in Nature Scientific Reports the basis for our patent on a new method of manufacturing neural stem cells, which is used to produce the clinical-grade cells necessary for future clinical studies and commercialization. In 2014, we completed the majority of the preclinical research, establishing the safety profile of NSC in various animal species, including non-human primates. In June 2016, we published the results of a 12-month pre-clinical non-human primate study, which demonstrated the safety, efficacy and mechanism of action of the ISC- hpNSC. In 2017, we dosed four patients in our Phase I trial of ISC-hpNSC, human parthenogenetic stem cell-derived neural stem cells for the treatment of Parkinson's disease. We reported 12-month results from the first cohort and 6-month interim results of the second cohort at the Society for Neuroscience annual meeting (Neuroscience 2018) in November 2018. In April 2019, we announced the completion of subject enrollment, with the 12th subject receiving a transplantation of the highest dose of cells. There have been no safety signals or serious adverse effects seen to date as related to the transplanted ISC-hpNSC cells.

 We announced a successful completion of the dose escalating phase 1 clinical trial in June 2021. In terms of preliminary efficacy, where scores are compared against baseline before transplantation, we observed a potential dose-dependent response with an apparent peak effectiveness at our middle dose. The % OFF-Time, which is the time during the day when levodopa medication is not performing optimally and PD symptoms return, decreased an average 47% from the baseline at 12 months post transplantation in cohort 2. This trend continued through 24 months where the % OFF-Time in the second cohort dropped by 55% from the initial reading. The same was true for % ON-Time without dyskinesia, which is the time during the day when levodopa medication is performing optimally without dyskinesia. The % ON-Time increased an average of 42% above the initial evaluation at 12 months post-transplantation in the second cohort.

 Stroke: In August 2014, we announced the launch of a stroke program, evaluating the use of ISC-hpNSC transplantation for the treatment of ischemic stroke using a rodent model of the disease. The Company has a considerable amount of safety data on ISC-hpNSC from the Parkinson's disease program and, as there is evidence that transplantation of ISC-hpNSC may improve patient

 outcomes as an adjunctive therapeutic strategy in stroke, having a second program that can use this safety dataset is therefore a logical extension. In 2015, the Company together with Tulane University demonstrated that NSC can significantly reduce neurological dysfunction after a stroke in animal models.

 TBI: In October 2016, we announced the results of the pre-clinical rodent study, evaluating the use of ISC-hpNSC transplantation for the treatment of TBI. The study was conducted at the University of South Florida Morsani College of Medicine. We demonstrated that animals receiving injections of ISC-hpNSC displayed the highest levels of improvements in cognitive performance and motor coordination compared to vehicle control treated animals. In February 2019, we published the results of the pre-clinical study in Theranostics, a prestigious peer-reviewed medical journal. The publication titled, "Human parthenogenetic neural stem cell grafts promote multiple regenerative processes in a traumatic brain injury model," demonstrated that the clinical-grade neural stem cells used in our Parkinson's disease clinical trial, ISC-hpNSC, significantly improved TBI-associated motor, neurological, and cognitive deficits without any safety issues.

 Anti-Aging Cosmetic Market – Skin Care Products

 Our wholly owned subsidiary Lifeline Skin Care, Inc. ("LSC") develops, manufactures, and sells anti-aging skin care products based on two core technologies: encapsulated extract derived from hpSC and specially selected targeted small molecules. LSC's products include:

 • ProPlus Advanced Defense Complex

 • ProPlus Advanced Recovery Complex

 • ProPlus Eye Firming Complex

 • ProPlus Neck Firming Complex

 • ProPlus Advanced Aqueous Treatment

 • ProPlus Collagen Booster (Advanced Molecular Serum)

 • ProPlus Elastin Booster

 • ProPlus Brightening Toner

 LSC's products are regulated as cosmetics. LSC's products are sold domestically through a branded website, Amazon, and ecommerce partners.

 Biomedical Market – Primary Human Cell Research Products

 Our wholly owned subsidiary LCT develops, manufactures and commercializes approximately 200 human cell culture products, including frozen human "primary" cells and the reagents (called "media") needed to grow, maintain and differentiate the cells. LCT's scientists have used a standardized, methodical, scientific approach to basal medium optimization to systematically produce optimized products designed to culture specific human cell types and to elicit specific cellular behaviors. These techniques can also be used to produce products that do not contain non-human animal proteins, a feature desirable to the research and therapeutic markets. Each LCT cell product is quality tested for the expression of specific markers (to assure the cells are the correct type), proliferation rate, viability, morphology and absence of pathogens. Each cell system also contains associated donor information and all informed consent requirements are strictly followed. LCT's research products are marketed and sold by its internal sales force, OEM partners and LCT brand distributors in Europe and Asia.

 Results of Operations

 Comparison of the Years Ended December 31, 2023 and 2022

 The following table summarizes our results of operations for the years ended December 31, 2023 and 2022, together with the dollar and percent change in those items (in thousands):

 2023

 2022

 $ Change

 % Change

 Product sales

 $

 7,789

 $

 8,180

 $

 (391

)

 -5

 %

 Cost of sales

 3,181

 3,269

 (88

)

 -3

 %

 Profit margin

 4,608

 4,911

 (303

)

 -6

 %

 As a % of revenues

 %

 %

 General and administrative

 3,514

 3,357

 %

 Selling and marketing

 1,246

 1,245

 %

 Research and development

 %

 Other income (expense), net

 (148

)

 *

 $

 (131

)

 $

 (331

)

 $

 -60

 %

 As a % of revenues

 -2

 %

 -4

 %

 * denotes a change in excess of 100%

 Product Sales

 Product sales revenue for the year ended December 31, 2023 was $7,789 thousand, compared to $8,180 thousand for the year ended December 31, 2022. The decrease of $391 thousand, or 5%, was attributable to a decrease of $448 thousand in media product sales within our biomedical market segment primarily due to lower sales volume based on customer demand and a decrease of $126 thousand in sales of our skin care products in our anti-aging market segment during 2023 compared to 2022 due to the discontinuation of a product line described below. These decreases were partially offset by an increase of $183 thousand in cell product sales from our biomedical market segment.

 Our original equipment manufacturer ("OEM") sales in our biomedical market segment have remained fairly stable year-over-year, with OEM purchasing activity accounting for approximately 58% of sales in this market segment. In 2023, there was a change in the mix of sales from OEM customers as cell sales increased and media sales decreased. As media sales typically account for approximately 70% of sales in our biomedical market segment, the decrease in sales is primarily driven by the decrease in media sales. The change in the mix of sales is believed to be the result of normalization of OEM planning systems and lead time measurement post COVID-19 supply chain challenges.

 Our professional line of anti-aging products was discontinued in 2022 resulting in only one product line and less overall demand. Our professional anti-aging product line is sold to consumers exclusively through our ecommerce channel with less marketing and store front or medical office exposure contributing to the decrease in product sales. In addition, high percentage promotions were decreased leading to a lesser volume of transactions.

 Cost of Sales

 Cost of sales for the year ended December 31, 2023 was $3,181 thousand, compared to $3,269 thousand for the year ended December 31, 2022. The decrease of $88 thousand, or 3%, was primarily attributable a lower cost of direct materials used in products from both the biomedical and anti-aging market segments of $158 thousand and a decrease of freight and shipping costs of $24 thousand. This decrease was partially offset by higher salaries and benefits, including stock-based compensation, of $52 thousand and an increase in overhead and general laboratory supplies of $29 thousand.

 Profit margin was 59% for the year ended December 31, 2023 as compared to 60% for the year ended December 31, 2022. The decrease in profit margin was primarily driven by manufacturing inefficiencies as a result of less sales.

 Cost of sales consists primarily of salaries and benefits associated with employee efforts expended directly on the production of the Company's products, as well as related direct materials, general laboratory supplies and an allocation of overhead. We aim to continue refining our manufacturing processes and supply chain management to improve the cost of sales as a percentage of revenue for both LCT and LSC.

 General and Administrative Expenses

 General and administrative expenses for the year ended December 31, 2023 was $3,514 thousand, compared to $3,357 thousand for the year ended December 31, 2022. The increase of $157 thousand, or 5%, was primarily attributable to an increase in consulting, audit, and brokers fees of $246 thousand combined with higher salaries and benefits, including stock-based compensation, of $32 thousand, and an increase in logistics costs of $17 thousand. These increases were partially offset by decreases in legal expenses and directors and officers insurance fees of $93 thousand, a decrease in licenses and permit fees of $32 thousand, and a decrease in meals and entertainment expense of $14 thousand.

 Our general and administrative expenses consist primarily of employee-related expenses including salaries, bonuses, benefits and stock-based compensation. Other significant costs include facility costs not otherwise included in or allocated to other departments, corporate legal fees not relating to patents, and fees for accounting and consulting services.

 Selling and Marketing Expenses

 Selling and marketing expenses for the year ended December 31, 2023 was $1,246 thousand, compared to $1,245 thousand for the year ended December 31, 2022. Overall sales and marketing expenses have remained relatively flat year-over-year with an increase of $72 thousand in consulting fees largely offset by a decrease in logistics of $27 thousand, a decrease in advertising costs of $17 thousand, a decrease in personnel-related costs, including sales commissions, of $8 thousand, and a decrease in subscriptions and dues of $7 thousand. The change in expense year-over-year is primarily attributable to changes in our anti-aging market segment.

 Our sales and marketing expenses consist primarily of personnel-related expenses, such as salaries, benefits, and stock-based compensation, facility costs not otherwise included in or allocated to other departments, as well as marketing material costs, permits and licenses for ecommerce, and other advertising type expenses.

 Research and Development Expenses

 Research and development expenses for the year ended December 31, 2023 was $511 thousand, compared to $492 thousand for the year ended December 31, 2022. The increase of $19 thousand, or 4%, was primarily attributable to a $128 thousand increase in personnel-related costs from increased salaries and stock-based compensation awards granted. The increase was partially offset by a decrease in general lab expenses and materials of $37 thousand, a decrease in the Astellas licensing fees of $31 thousand from the expiration of the licensing agreement in July 2022, and a decrease in consulting fees of $18 thousand. The increase is also offset by an increase of $21 thousand in our Australian research and development tax credit related to qualifiable expenditures from our research and development activities of our Australian subsidiary, Cyto Therapeutics.

 Our research and development efforts are primarily focused on the development of treatments for Parkinson's disease, traumatic brain injury, liver diseases, stroke, and the creation of new GMP grade human parthenogenetic stem cell lines. These projects are long-term investments that involve developing both new stem cell lines and new differentiation techniques that can provide higher purity populations of functional cells. Research and development expenses are expensed as incurred and are accounted for on a project-by-project basis. However, much of our research has potential applicability to each of our projects.

 Other Income (Expense), Net

 Other income, net for the year ended December 31, 2023 was a $532 thousand compared to other expense, net of $148 thousand for the year ended December 31, 2022. Other income of $671 thousand was primarily attributable to a one-time receipt of the Employee Retention Tax Credit for certain employment taxes enacted by the U.S. government in response to the COVID-19 outbreak of $663 thousand in 2023 (refer to Note 8 – Employee Retention Credit within the accompanying consolidated financial statements for further discussion), which was partially offset by other expense. Other expense in both periods primarily relate to interest expense on our related party note payable (refer to Note 10 – Related Party Transactions within the accompanying consolidated financial statements for further discussion).

 Liquidity and Capital Resources

 The Company enters into contracts in the normal course of business with various third-party consultants and contract research organizations ("CRO") for preclinical research, clinical trials and manufacturing activities. These contracts generally provide for termination upon notice. Actual expenses associated with these arrangements may be higher or lower due to various reasons, including but not limited to, progress of our development products, and enrollment in clinical trials. Other short-term and long-term commitments that would affect liquidity include lease obligations as well as related party debt repayments.

 As of December 31, 2023, we had an accumulated deficit of approximately $110.5 million and have, on an annual basis, incurred net losses and negative operating cash flows since inception. Substantially all of our operating losses have resulted from the funding of our research and development programs and general and administrative expenses associated with our operations. We incurred net losses of $131 thousand, which includes the one-time receipt of the Employee Retention Tax Credit of $663 thousand, and $331 thousand for years ended December 31, 2023 and 2022, respectively. As of December 31, 2023, we had cash of $1.6 million, compared to $742 thousand as of December 31, 2022.

 Licensed Patents

 The Company had a minimum annual license fee of $75 thousand payable in two installments per year to Astellas Pharma pursuant to the amended UMass IP license agreement. The patents, along with the license agreement, expired at the end of July 2022. These patents were fully impaired in prior years and therefore the expiration did not result in any additional impairment for the year ended December 31, 2022. The Company does not anticipate any short-term liquidity effects from this obligation as we will no longer be liable for the annual licensing fee.

 Cash Flows

 Comparison of the Years Ended December 31, 2023 and 2022

 The following table provides information regarding our cash flows for the years ended December 31, 2023 and 2022 (in thousands):

 2023

 2022

 Net cash provided by operating activities

 $

 $

 Net cash used in investing activities

 (83

)

 (11

)

 Net cash provided by financing activities

 —

 Net increase in cash

 $

 $

 Operating Cash Flows

 For the year ended December 31, 2023, net cash provided by operating activities was $929 thousand, resulting primarily from our net loss of $131 thousand, which includes the one-time receipt of the Employee Retention Tax Credit of $663 thousand, and net changes in operating assets and liabilities of $100 thousand, consisting primarily of an increase in accounts payable of $42 thousand, and decreases in operating lease liabilities of $229 thousand, accounts receivable of $173 thousand, and inventories of $141 thousand. The decrease in cash is offset by recurring non-cash adjustments to net income of $960 thousand, including depreciation and amortization expense, stock-based compensation expense, operating lease expense, and related party note payable interest expense. For the year ended December 31, 2022, net cash provided by operating activities was $332 thousand, resulting primarily from our net loss of $331 thousand and changes in operating assets and liabilities of $226 thousand, partially offset by recurring non-cash adjustments to net income of $890 thousand, including depreciation and amortization expense, stock-based compensation expense, operating lease expense, and interest expense.

 Investing Cash Flows

 Net cash used in investing activities for the year ended December 31, 2023 was $83 thousand, compared to $11 thousand for the year ended December 31, 2022. The increase in cash used in investing activities was primarily attributable to an increase in purchases of property and equipment of $79 thousand for leasehold improvements, partially offset by a decrease in payments for patent licenses of $7 thousand from 2023 compared to 2022.

 Financing Cash Flows

 For year ended December 31, 2023, no net cash was provided by financing activities compared to $250 thousand cash provided for the year ended December 31, 2022. For the year ended December 31, 2022, cash provided by financing activities was wholly attributable to proceeds from our related party note payable (refer to Note 10 – Related Party Transactions within the accompanying consolidated financial statements for further discussion).

 Going Concern

 Management continues to evaluate various financing sources and options to raise working capital to help fund our current research and development programs and operations. We will need to obtain significant additional capital from sources including exercise of outstanding warrants, equity and/or debt financings, license arrangements, grants and/or collaborative research arrangements to sustain our operations and develop products. Unless we obtain additional financing, we do not have sufficient cash on hand to sustain our operations at least through one year after the issuance date. The timing and degree of any future capital requirements will depend on many factors, including:

 • the accuracy of the assumptions underlying the estimates for capital needs in 2024 and beyond;

 • the extent that revenues from sales of LSC and LCT products cover the related costs and provide capital;

 • scientific progress in our research and development programs;

 • the magnitude and scope of our research and development programs and our ability to establish, enforce and maintain strategic arrangements for research, development, clinical testing, manufacturing and marketing;

 • our progress with pre-clinical development and clinical trials;

 • the extent to which third party interest in Company's research and commercial products can be realized through effective partnerships;

 • the time and costs involved in obtaining regulatory approvals;

 • the costs involved in preparing, filing, prosecuting, maintaining, defending and enforcing patent claims;

 • the number and type of product candidates that we pursue; and

 • the development of major public health concerns, such as the novel coronavirus outbreak, or other pandemics arising globally, and its impact on our business operations and funding requirements.

 Our failure to raise capital or enter into applicable arrangements when needed would have a negative impact on our financial condition. Additional debt financing may be expensive and require us to pledge all or a substantial portion of its assets. Further, if additional funds are obtained through arrangements with collaborative partners, these arrangements may require us to relinquish rights to some of its technologies, product candidates or products that we would otherwise seek to develop and commercialize on its own. If sufficient capital is not available, we may be required to delay, reduce the scope of or eliminate one or more of its product initiatives.

 We currently have no revenue generated from our principal operations in therapeutic and clinical product development through research and development efforts. There can be no assurance that we will be successful in maintaining our normal operating cash flow and obtaining additional funds and that the timing of our capital raising, or future financing will result in cash flow sufficient to sustain our operations at least through one year after the issuance date.

 Based on the factors above, there is substantial doubt about our ability to continue as a going concern. The consolidated financial statements were prepared assuming that we will continue to operate as a going concern. The consolidated financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classification of liabilities that may result from the outcome of this uncertainty. Management's plans in regard to these matters are focused on managing our cash flow, the proper timing of our capital expenditures, and raising additional capital or financing in the future.

 Critical Accounting Estimates

 Our discussion and analysis of our financial condition and results of operations is based upon our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States. The preparation of these financial statements requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and related disclosures. On an on-going basis, we evaluate our estimates and assumptions, and we base our estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions and conditions.

 Our significant accounting policies are more fully described in Note 1 – Description of Business and Summary of Significant Accounting Policies to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K. Our most critical

 accounting estimates include current and non-current inventories and stock-based compensation. We review our estimates and assumptions periodically and reflect the effects of revisions in the period in which they are deemed to be necessary. We believe that the following accounting policies are critical to the judgments and estimates used in preparation of our consolidated financial statements.

 Allowance for Excess and Obsolete Inventory

 Our inventories, particularly within our biomedical market, consist of certain products that have a long or, when frozen, indefinite shelf life. In addition, future demand for our products is uncertain. Accordingly, at each reporting period, we estimate a reserve for allowance for excess and obsolete inventory. This estimate is computed using historical sales data and inventory turnover rates, which are subjective in nature and fluctuate between periods. The establishment of a reserve for excess and obsolete inventory establishes a new cost basis in the inventory with a corresponding adjustment to cost of sales. If we are able to sell such inventory, any related reserves are reduced in the period of sale. The Company's allowance for excess and obsolete inventory was $739 thousand and $637 thousand as of December 31, 2023 and 2022, respectively. A 10% change in our reserve estimate in total as of December 31, 2023 would result in a change in reserve of approximately $74 thousand. Our reserves are estimates, which could vary significantly, either favorably or unfavorably, from actual results if future economic conditions, consumer demand and competitive environments differ from our expectations.

 Stock-Based Compensation

 We are required to measure and recognize compensation expense for all stock-based payment awards made to employees and consultants based on estimated fair value. We estimate the fair value of stock options granted using the Black-Scholes option-pricing model.

 The determination of fair value of stock-based awards using the Black-Scholes option-pricing model requires the use of certain estimates and subjective assumptions that affect the amount of stock-based compensation expense recognized in our consolidated statements of operations. These include estimates of the expected volatility of our stock price, expected option life, expected dividends and the risk-free interest rate. Estimated volatility is a measure of the amount by which our stock price is expected to fluctuate each year during the expected life of the award. The expected option life is calculated using the Simplified Method as prescribed by accounting guidance for stock-based compensation. We determined expected dividend yield to be 0% given that we have never declared or paid any cash dividends on our common stock, and we currently do not anticipate paying such cash dividends. The risk-free interest rate is based upon United States Treasury securities with remaining terms similar to the expected term of the stock-based awards. If any of the assumptions used in the Black-Scholes model change significantly, stock-based compensation expense may differ materially from what we have recorded in the current period.

 Recently Issued Accounting Pronouncements

 A description of recently issued accounting pronouncements that may potentially impact our financial position and results of operations is disclosed in Note 1 – Description of Business and Summary of Significant Accounting Policies to our consolidated financial statements included in this Annual Report on Form 10-K.

 ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

 Not required.

 ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.

 The information required by this Item is set forth in our consolidated financial statements and accompanying notes thereto beginning at Page F-1 of this Annual Report on Form 10-K.

 ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE.

 None.

 ITEM 9A. CONTROLS AND PROCEDURES.

 Disclosure Controls and Procedures

 Evaluation of Disclosure Controls and Procedures

 As required by Rule 13a-15(e) and 15d-15(e) under the Exchange Act, the Company, with the participation of management, including our Chief Executive Officer and Principal Financial Officer, evaluated the effectiveness of our disclosure controls and procedures (as defined in such rules) as of the end of the period covered by this report. Based on this evaluation, our Chief Executive Officer and Principal Financial Officer concluded that, as of December 31, 2023, our disclosure controls and procedures were effective.

 Disclosure controls and procedures are controls and other procedures that are designed to ensure that information required to be disclosed in our reports filed or submitted under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC's rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed in our reports filed under the Exchange Act is accumulated and communicated to our management, including our Chief Executive Officer and Principal Financial Officer, or persons performing similar functions, as appropriate, to allow timely decisions regarding required disclosure.

 Additionally, controls can be circumvented by the individual acts of some persons, by collusion of two or more people, or by management override of the control. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions, or the degree of compliance with the policies or procedures may deteriorate. Because of the inherent limitations in a cost-effective control system, misstatements due to error or fraud may occur and not be detected.

 Management Report on Internal Control Over Financial Reporting

 Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control system is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles in the United States ("GAAP")and includes those policies and procedures that:

 (i) pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of the assets of the Company;

 (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with GAAP, and that receipts and expenditures of the Company are being made only in accordance with authorization of management and directors of the Company; and

 (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the Company's assets that could have a material effect on its financial statements.

 Because of its inherent limitations, a system of internal control over financial reporting can provide only reasonable assurance and may not prevent or detect misstatements. Further, because of changes in conditions, effectiveness of internal controls over financial

 reporting may vary over time. Our system contains self-monitoring mechanisms, and actions are taken to correct deficiencies as they are identified.

 Our management conducted an evaluation of the effectiveness of the system of internal control over financial reporting based on the framework in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (the 2013 COSO Framework). Based on the above evaluation, the Company's Chief Executive Officer and Principal Financial Officer have concluded that our internal control over financial reporting was effective as of December 31, 2023.

 Remediation of Previously Disclosed Material Weakness

 As disclosed in Part II, Item 9A. Controls and Procedures of our Annual Report on Form 10-K for the year ended December 31, 2022, we identified a material weakness in internal control related to ineffective controls over the Company's LCT inventory reserve as reserves were inappropriately reversed on a per unit basis.

 During the year ended December 31, 2023, management implemented our previously disclosed remediation plan to include specific review procedures to ensure inventory reserves are not inappropriately reversed. This included engaging external advisors to oversee the remediation process, enhancing the design of inventory reserve related controls to include review procedures that ensure inventory reserves are properly accounted for and not reversed on a per unit basis, establishing a more robust review processes and procedures, and engaging outside consultants with the necessary technical expertise to supplement the Company's resources.

 As of December 31, 2023, management's remediation plan was fully implemented, and the enhanced internal controls operated effectively for a sufficient period of time. As such, management has concluded that the material weakness previously identified has been remediated as of December 31, 2023.

 Changes in Internal Control Over Financial Reporting

 Except for the remediation of our previously disclosed material weakness, there were no changes in our internal controls during the year ended December 31, 2023, that materially affected, or are reasonably likely to materially affect, our internal controls over financial reporting.

 ITEM 9B. OTHER INFORMATION

 None.

 ITEM 9C. DISCLOSURES REGARDING FOREIGN JURISDICTIONS THAT PREVENT INSPECTIONS

 None.

 ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

 The information required by this Item regarding our directors is incorporated by reference to the information in our definitive Proxy Statement (the "Proxy Statement") expected to be filed with the Securities and Exchange Commission within 120 days of December 31, 2023, in connection with our 2024 Annual Meeting of Stockholders under the heading "Election of Directors." The information required by this Item regarding our Code of Conduct and Ethics in incorporated by reference to the information in the Proxy Statement, expected to be filed within 120 days of December 31, 2023, under the caption "Code of Conduct and Ethics." The information required by this Item regarding our Governance Committee and Audit Committee is incorporated by reference to the information in the Proxy Statement, expected to be filed within 120 days of December 31, 2023, under the caption "Corporate Governance."

 As of December 31, 2023, our executive officers were as follows:

 Name

 Position

 Age

 Andrey Semechkin

 Co-Chairman and Chief Executive Officer

 Russell Kern

 Executive Vice President, Chief Scientific Officer, and Principal Financial Officer

 Andrey Semechkin, Ph. D., Co-Chairman and CEO, has been a Director of the Company since December 2008. Dr. Semechkin has served as our Chief Executive Officer since November 2009, and from December 2008 to November 2009 he served in other senior management positions with the Company. Dr. Semechkin is a specialist in system analysis, strategic planning and corporate management. He is a member of the Russian Academy of Sciences and has been Deputy Director of Institute of System Analysis since 2004. Dr. Semechkin was awarded the Russian Government Award in Science and Technology in 2006 and has written several scientific books. He has over 30 years' experience creating and managing businesses across different industries and scientific sectors.

 Russell Kern, Ph. D., Executive Vice President, Chief Scientific Officer, Principal Financial Officer, and CEO of Lifeline Skin Care Inc., became a Director in October 2008. Dr. Kern has served as our Chief Scientific officer since June 2013 and previously served since December 2008 in various scientific and management positions, including as Vice President Research and Development. Dr. Kern was trained in medical genetics, embryology and stem cell biology. He holds a Ph. D. degree in Human Physiology from the Russian Academy of Medical Sciences and has broad expertise in neuroscience, and was part of the team, along with scientists from the NYU Medical School that elucidated the physiological changes that occur in the brains of Parkinson's disease patients. Dr. Kern directs ISCO's R&D programs including stem cell derivation, differentiation and the pre-clinical and clinical evaluation of stem cell derived cells and tissue. He has developed a general method of deriving highly pure populations of neural stem cells and dopaminergic neurons from pluripotent stems cells that is novel, practical and suitable for use in a clinical setting. Dr. Kern is a well-known speaker on stem cell biology, including the use of stem cells for neurology and skin regeneration. He has more than 40 publications in the field of Parkinson's disease and stem cell biology, and he is an active member of the American Academy of Neurology and the Society for Neuroscience. Dr. Russell Kern is the son of Dr. Andrey Semechkin, our Co-Chairman and Chief Executive Officer.

 ITEM 11. EXECUTIVE COMPENSATION

 The information required by this Item is incorporated by reference to the information in the Proxy Statement, expected to be filed within 120 days of December 31, 2023, under the caption "Executive Compensation."

 ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

 The information required by this Item is incorporated by reference to the information in the Proxy Statement, expected to be filed within 120 days of December 31, 2023, under the captions "Stock Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters" and "Equity Compensation Plan Information."

 ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

 The information required by this Item is incorporated by reference to the information in the Proxy Statement, expected to be filed within 120 days of December 31, 2023, under the captions "Related Person Transactions" and "Corporate Governance – Director Independence."

 ITEM 14. PRINCIPAL ACCOUNTING FEES AND SERVICES

 The information required by this Item is incorporated by reference to the information in the Proxy Statement, expected to be filed within 120 days of December 31, 2023, under the caption "Principal Accounting Fees and Services."

 ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

 (a) Documents filed as part of this report.

 1. Financial Statements

 As part of this Annual report on Form 10-K, the consolidated financial statements are listed in the accompanying index to financial statements on Page F-1.

 2. Financial Statement Schedules

 All schedules are omitted because they are not applicable or the required information is shown in the consolidated financial statements or accompanying notes thereto.

 3. Exhibit Index

 The following is a list of exhibits filed as part of this Annual Report on Form 10-K (including those incorporated herein by reference):

 Exhibit

 Number

 Exhibit Description

 3.1

 Certificate of Incorporation (incorporated by reference to Exhibit 3.4 of the Registrant's Form 10-SB filed on April 4, 2006).

 3.2

 Certificate of Amendment of Certificate of Incorporation (incorporated by reference to Exhibit 3.1 of the Registrant's Preliminary Information Statement on Form 14C filed on December 29, 2006).

 3.3

 Certificate of Amendment of Certificate of Incorporation (incorporated by reference to Exhibit 3.1 of the Registrant's Form 8-K filed on June 4, 2012).

 3.4

 Certificate of Amendment to Certificate of Incorporation (incorporated by reference to Exhibit 3.1 of the Registrant's Form 8-K filed on December 5, 2014).

 3.5

 Certificate of Amendment to Certificate of Incorporation (incorporated by reference to Exhibit 3.1 of the Registrant's Form 8-K filed on July 28, 2015).

 3.6

 Certificate of Amendment to Certificate of Incorporation (incorporated by reference to Exhibit 3.1 of the Registrant's Form 8-K filed on May 19, 2017).

 3.7

 Amended and Restated Bylaws of the Registrant (incorporated by reference to Exhibit 3.1 of the Registrant's Form 8-K filed on May 6, 2011).

 4.1

 Form of Specimen Common Stock Certificate (incorporated by reference to Exhibit 4.1 of the Registrant's Form 10-KSB filed on April 9, 2007).

 4.2

 Certification of Designation of Series B Preferred Stock (incorporated by reference to Exhibit 4.1 of the Registrant's Form 8-K filed on May 12, 2008).

 4.3

 Certification of Designation of Series D Preferred Stock (incorporated by reference to Exhibit 10.2 of the Registrant's Form 8-K filed on January 5, 2009).

 4.4

 Certificate of Designation of Series G Preferred Stock (incorporated by reference to Exhibit 3.1 of the Registrant's Form 8-K filed on March 14, 2012).

 4.5

 Certificate of Preferences, Rights and Limitations of Series I-2 Convertible Preferred Stock (incorporated by reference to Exhibit 3.2 of the Registrant's Form 8-K filed on March 10, 2016).

 4.6

 Description of the Registrant's Securities Registered Pursuant to Section 12 of the Securities Exchange Act of 1934 (incorporated by reference to Exhibit 4.7 of the Registrant's Form 10-K filed March 30, 2021).

 10.1

 Amended and Restated 2010 Equity Participation Plan dated September 21, 2023 (incorporated by reference to Appendix A of the Registrant's Form14C filed on September 27, 2023).

 10.2

 Amended and Restated Investors Rights Agreement dated March 9, 2012 (incorporated by reference to Exhibit 10.2 of the Registrant's Form 8-K filed on March 15, 2012).

 10.3

 Management Rights Letter dated March 9, 2012 (incorporated by reference to Exhibit 10.3 of the Registrant's Form 8-K filed on March 15, 2012).

 10.4

 Dividend Waiver Agreement dated October 12, 2012 (incorporated by reference to Exhibit 10.29 of the Registrant's Form S-1 filed on October 18, 2012).

 10.5

 Amended and Restated License Agreement with Advanced Cell Technology, Inc. dated February 7, 2013 (ACT IP) (incorporated by reference to Exhibit 10.1 of the Registrant's Amendment to Form 8-K filed on February 14, 2013).

 10.6

 Amended and Restated License Agreement with Advanced Cell Technology, Inc. (UMass IP) (incorporated by reference to Exhibit 10.3 of the Registrant's Amendment to Form 8-K filed on February 14, 2013).

 10.7

 Amended and Restated License Agreement dated February 7, 2013 with Advanced Cell Technology, Inc. (Infigen IP) (incorporated by reference to Exhibit 10.2 of the Registrant's Amendment to Form 8-K filed on February 14, 2013).

 10.8

 Amendment dated November 13, 2014 to Amended and Restated Investor Rights Agreement dated as of March 9, 2012 (incorporated by reference to Exhibit 10.1 of the Registrant's Form 8-K filed on November 18, 2014).

 10.9

 Waiver Agreement dated December 31, 2014 with holders of Series G Preferred Stock (incorporated by reference by Exhibit 10.32 of the Registrant's Form 10-K filed March 30, 2015).

 10.10

 Registration Rights Agreement, dated January 8, 2016, by and between International Stem Cell Corporation and Andrey Semechkin (incorporated by reference to Exhibit 10.3 of the Registrant's Form 8-K filed on January 12, 2016).

 10.11

 Form of Registration Rights Agreement (incorporated by reference to Exhibit 10.2 of the Registrant's Form 8-K filed on March 10, 2016).

 10.12

 Lease Agreement dated October 26, 2021 (incorporated by reference to Exhibit 10.12 of the Registrant's Form 10-K filed on March 29, 2022).

 10.13

 Lease Agreement dated November 30, 2021 (incorporated by reference to Exhibit 10.13 of the Registrant's Form 10-K filed on March 29, 2022).

 10.14

 Co-Tenant Agreement dated December 15, 2021 (incorporated by reference to Exhibit 10.14 of the Registrant's Form 10-K filed on March 29, 2022).

 10.15

 Form of Note issued on March 1, 2022 (incorporated by reference to Exhibit 10.1 of Registrant's Form 8-K filed on March 3, 2022).

 10.16

 Form of Note issued on September 15, 2022 (incorporated by reference to Exhibit 10.1 of Registrant's Form 8-K filed on September 16, 2022).

 10.17

 Form of Note issued on March 1, 2023 (incorporated by reference to Exhibit 10.1 of Registrant's Form 8-K filed on March 16, 2023).

 10.18

 Form of Note issued on September 15, 2023 (incorporated by reference to Exhibit 10.1 of Registrant's Form 8-K filed on September 18, 2023).

 21.1

 Subsidiaries of the Registrant (incorporated by reference to Exhibit 21.1 of the Registrant's Form 10-K filed on March 30, 2016)

 23.1*

 Consent of BDO USA, P.C.

 24.1*

 Power of Attorney (included on signature page hereto)

 31.1*

 Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer

 31.2*

 Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer

 32.1*

 Section 1350 Certification of Chief Executive Officer

 32.2*

 Section 1350 Certification of Chief Financial Officer

 97.1*

 Policy for Recovery of Erroneously Awarded Incentive Compensation

 101.INS*

 101.SCH*

 104*

 * Filed herewith.

 (c) Financial Statement Schedules. Refer to Part IV, Item 15(a)2 above.

 ITEM 16. FORM 10-K SUMMARY

 None.

 SIGNATURES

 Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

 INTERNATIONAL STEM CELL CORPORATION

 By:

 /s/ ANDREY SEMECHKIN

 Name:

 Andrey Semechkin

 Title:

 Chief Executive Officer

 Dated: March 28, 2024

 POWER OF ATTORNEY

 KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Andrey Semechkin and Russell Kern, jointly and severally, his attorneys-in-fact, each with the power of substitution, for him or her in any and all capacities, to sign any amendments to this Annual Report on Form 10-K, and to file the same, with exhibits thereto and other documents in connection therewith with the Securities and Exchange Commission, hereby ratifying and confirming all that each of said attorneys-in-fact, or his substitute or substitutes may do or cause to be done by virtue hereof.

 Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

 Signature:

 Capacity:

 Date:

 /s/ ANDREY SEMECHKIN

 Co-Chairman of the Board and Chief Executive Officer (Principal Executive Officer)

 Andrey Semechkin

 /s/ RUSSELL KERN

 Executive Vice President, Chief Scientific Officer, and

 Russell Kern

 Director (Principal Financial and Accounting Officer)

 /s/ DONALD A. WRIGHT

 Co-Chairman of the Board

 Donald A. Wright

 /s/ PAUL V. MAIER

 Director

 Paul V. Maier

 Index to Consolidated Financial Statements

 Page

 Report of Independent Registered Public Accounting Firm ( BDO USA, P.C.; San Diego, California; PCAOB ID No. 243)

 Consolidated Balance Sheets

 Consolidated Statements of Operations

 Consolidated Statements of Changes in Redeemable Convertible Preferred Stock and Stockholders' Deficit

 Consolidated Statements of Cash Flows

 Notes to Consolidated Financial Statements

 Report of Independent Registered Public Accounting Firm

 Stockholders and Board of Directors

 International Stem Cell Corporation

 San Diego, California

 Opinion on the Consolidated Financial Statements

 We have audited the accompanying consolidated balance sheets of International Stem Cell Corporation (the "Company") as of December 31, 2023 and 2022, the related consolidated statements of operations, changes in redeemable convertible preferred stock and stockholders' deficit, and cash flows for the years then ended and the related notes (collectively referred to as the "consolidated financial statements"). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2023 and 2022, and the results of its operations and its cash flows for the years then ended, in conformity with accounting principles generally accepted in the United States of America.

 Going Concern Uncertainty

 The accompanying consolidated financial statements have been prepared assuming that the Company will continue as a going concern. As discussed in Note 1 to the consolidated financial statements, the Company has a working capital deficit that raises substantial doubt about its ability to continue as a going concern. Management's plans in regard to these matters are also described in Note 1. The consolidated financial statements do not include any adjustments that might result from the outcome of this uncertainty.

 Basis for Opinion

 These consolidated financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company's consolidated financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB") and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

 We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Company's internal control over financial reporting. Accordingly, we express no such opinion.

 Our audits included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our audits provide a reasonable basis for our opinion.

 Critical Audit Matter

 The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the consolidated financial statements and (2) involved our especially challenging, subjective, or complex judgments. The communication of a critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing separate opinions on the critical audit matter or on the accounts or disclosures to which it relates.

 Inventory Valuation – Excess and Obsolete Inventory

 As described in Note 1 to the consolidated financial statements, the Company reviews the components of its inventory on a periodic basis for excess and obsolescence and adjusts inventory to the lower of cost or net realizable value as necessary. The Lifeline Cell Technology ("LCT") inventory has a long product life cycle, does not have a shelf life when frozen and future demand is uncertain. As

 such, management estimates its reserve for allowance for excess and obsolete LCT inventory using historical sales data and inventory turnover rates.

 We identified auditing the Company's estimate for excess and obsolete LCT inventory as a critical audit matter. Auditing inventory turnover rates involves especially challenging auditor judgment due to the nature and extent of audit effort required to address the matter.

 The primary procedures we performed to address this critical audit matter included:

 • Testing the reliability of inventory turnover rates by agreeing certain sales and inventory movement data to relevant source documents.

 • Testing the accuracy of the excess and obsolete LCT inventory reserve calculation.

 /s/ BDO USA, P.C.

 We have served as the Company's auditor since 2019.

 San Diego, California

 Consolidated Balance Sheets

 (In thousands, except share and par value data)

 2023

 2022

 Assets

 Current assets:

 Cash

 $

 1,588

 $

 Accounts receivable, net

 Inventories

 1,263

 1,384

 Prepaid expenses and other current assets

 Total current assets

 3,521

 2,963

 Non-current inventories

 Property and equipment, net

 Intangible assets, net

 Right-of-use assets

 Deposits and other assets

 Total assets

 $

 5,390

 $

 5,135

 Liabilities, Redeemable Convertible Preferred Stock and Stockholders' Deficit

 Current liabilities:

 Accounts payable

 $

 $

 Accrued liabilities

 Operating lease liabilities, current

 Advances

 Related party note payable

 3,457

 3,325

 Total current liabilities

 4,832

 4,635

 Operating lease liabilities, net of current portion

 Total liabilities

 5,277

 5,355

 Commitments and contingencies (Note 11)

 Series D redeemable convertible preferred stock, $ 0.001 par value; 50 shares authorized;
 43 shares issued and outstanding; liquidation preference of $ 4,300 at December 31,
 2023 and December 31, 2022

 4,300

 4,300

 Stockholders' Deficit:

 Non-redeemable convertible preferred stock, $ 0.001 par value; 10,004,310 and
 10,004,310 shares authorized; 5,254,310 and 5,254,310 shares issued and
 outstanding; liquidation preference of $ 9,796 and $ 9,781 at December 31, 2023 and
 December 31, 2022, respectively

 Common stock, $ 0.001 par value; 120,000,000 shares authorized; 8,004,389
 shares issued and outstanding at December 31, 2023 and December 31, 2022

 Additional paid-in capital

 106,276

 105,812

 Accumulated deficit

 ( 110,476

)

 ( 110,345

)

 Total stockholders' deficit

 ( 4,187

)

 ( 4,520

)

 Total liabilities, redeemable convertible preferred stock and stockholders' deficit

 $

 5,390

 $

 5,135

 See accompanying notes to consolidated financial statements.

 Consolidated Statements of Operations

 (In thousands, except share and per share data)

 2023

 2022

 Product sales

 $

 7,789

 $

 8,180

 Operating expenses:

 Cost of sales

 3,181

 3,269

 General and administrative

 3,514

 3,357

 Selling and marketing

 1,246

 1,245

 Research and development

 Total operating expenses

 8,452

 8,363

 Loss from operations

 ( 663

)

 ( 183

)

 Other income (expense):

 Employee retention credit

 —

 Interest expense

 ( 139

)

 ( 135

)

 Other income (expense)

 ( 13

)

 Total other income (expense), net

 ( 148

)

 ( 131

)

 ( 331

)

 Net loss per common share, basic and diluted

 $

 ( 0.02

)

 $

 ( 0.04

)

 Weighted-average common shares used to compute net loss per share, basic and diluted

 8,004,389

 8,004,389

 See accompanying notes to consolidated financial statements.

 Consolidated Statements of Changes in Redeemable Convertible Preferred Stock and Stockholders' Deficit

 (In thousands)

 Series D Redeemable

 Non-redeemable

 Convertible

 Convertible

 Common

 Additional

 Total

 Preferred Stock

 Preferred Stock

 Stock

 Paid-in

 Accumulated

 Stockholders'

 Amount

 Amount

 Amount

 Capital

 Deficit

 Deficit

 Balance at December 31, 2021

 —

 $

 4,300

 5,254

 $

 8,004

 $

 $

 105,413

 $

 ( 110,014

)

 $

 ( 4,588

)

 —

 —

 —

 —

 —

 —

 —

 —

 —

 —

 —

 —

 —

 —

 ( 331

)

 ( 331

)

 Balance at December 31, 2022

 —

 4,300

 5,254

 8,004

 105,812

 ( 110,345

)

 ( 4,520

)

 —

 —

 —

 —

 —

 —

 —

 —

 —

 —

 —

 —

 —

 —

 ( 131

)

 ( 131

)

 Balance at December 31, 2023

 —

 $

 4,300

 5,254

 $

 8,004

 $

 $

 106,276

 $

 ( 110,476

)

 $

 ( 4,187

)

 See accompanying notes to consolidated financial statements.

 Consolidated Statements of Cash Flows

 (In thousands)

 2023

 2022

 Cash flows from operating activities

 $

 ( 131

)

 $

 ( 331

)

 Adjustments to reconcile net loss to net cash used in operating
 activities:

 Depreciation and amortization

 Non-cash operating lease expense

 Interest expense on related party note payable

 Changes in operating assets and liabilities:

 Accounts receivable

 Inventories

 ( 114

)

 Prepaid expenses and other current assets

 ( 6

)

 Deposits and other assets

 Accounts payable

 ( 186

)

 Accrued liabilities

 ( 23

)

 Operating lease liabilities

 ( 229

)

 ( 179

)

 Net cash provided by operating activities

 Cash flows from investing activities

 Purchases of property and equipment

 ( 80

)

 ( 1

)

 Payments for patent licenses

 ( 3

)

 ( 10

)

 Net cash used in investing activities

 ( 83

)

 ( 11

)

 Cash flows from financing activities

 Proceeds from note payable from a related party

 —

 Net cash provided by financing activities

 —

 Net increase in cash

 Cash, beginning of period

 Cash, end of period

 $

 1,588

 $

 Supplemental disclosure of cash flow information:

 Cash paid for interest

 $

 $

 Supplemental disclosure of non-cash investing activities:

 Patent license costs included in accounts payable and accrued expense

 $

 $

 See accompanying notes to consolidated financial statements.

 Notes to Consolidated Financial Statements

 1. Description of Business and Summary of Significant Accounting Policies
 Description of Business
 International Stem Cell Corporation (the "Company") was organized in Delaware in June 2005 and is publicly traded on the OTCQX under the symbol "ISCO". The Company is primarily a research and development company, for the therapeutic market, which has focused on advancing potential clinical applications of human parthenogenetic stem cells ("hpSCs") for the treatment of various diseases of the central nervous system and liver diseases. The Company has the following wholly owned subsidiaries:
 • Lifeline Cell Technology, LLC ("LCT") – for the biomedical market, develops, manufactures and commercializes primary human cell research products including over 200 human cell culture products, including frozen human "primary" cells and the reagents (called "media") needed to grow, maintain and differentiate the cells;

 • Lifeline Skin Care, Inc. ("LSC") – for the anti-aging market, develops, manufactures and markets a category of anti-aging skin care products based on the Company's proprietary parthenogenetic stem cell technology and small molecule technology;

 • Cyto Therapeutics Pty. Ltd. ("Cyto Therapeutics") – performs research and development ("R&D") for the therapeutic market and is currently conducting clinical trials in Australia for the use of ISC-hpNSC in the treatment of Parkinson's disease.

 Liquidity and Going Concern
 The Company had an accumulated deficit of approximately $ 110.5 million as of December 31, 2023 and has historically incurred net losses and negative operating cash flows. The Company has had no revenue from its principal operations in therapeutic and clinical product development through research and development efforts. Unless the Company obtains additional financing, the Company does not have sufficient cash on hand to sustain operations for at least one year from the issuance date of these consolidated financial statements.
 There can be no assurance that the Company will be successful in maintaining normal operating cash flow or obtaining additional funding. These circumstances raise substantial doubt about the Company's ability to continue as a going concern. For the foreseeable future, the Company's ability to continue its operations is dependent upon its ability to obtain additional financing. The accompanying consolidated financial statements do not include any adjustments to reflect the possible future effects on the recoverability and classification of assets or the amounts and classifications of liabilities that may result from the outcome of the uncertainty concerning the Company's ability to continue as a going concern.
 The Company continues to evaluate various financing sources and options to raise working capital to help fund current research and development programs and operations. The Company will need to obtain significant additional funding from sources, including debt and/or equity financing, license arrangements, grants and/or collaborative research arrangements to sustain its operations and develop products.
 The timing and degree of any future capital requirements will depend on many factors, including:
 • the accuracy of the assumptions underlying the estimates for capital needs in 2024 and beyond;

 • the extent that revenues from sales of LSC and LCT products cover the related costs and provide capital;

 • scientific progress in research and development programs;

 • the magnitude and scope of the Company's research and development programs and its ability to establish, enforce and maintain strategic arrangements for research, development, clinical testing, manufacturing and marketing;

 • the progress with preclinical development and clinical trials;

 • the extent to which third party interest in Company's research and commercial products can be realized through effective partnerships;

 • the time and costs involved in obtaining regulatory approvals;

 • the costs involved in preparing, filing, prosecuting, maintaining, defending and enforcing patent claims;

 • the number and type of product candidates that the Company decides to pursue; and

 • the development of major public health concerns, such as the novel coronavirus outbreak, or other pandemics arising globally, and the current and future impact that such concerns may have on the Company's operations and funding requirements.

 Additional debt financing may be expensive and require the Company to pledge all or a substantial portion of its assets. If additional funds are obtained through arrangements with collaborative partners, these arrangements may require the Company to relinquish rights to some of its technologies, product candidates or products that the Company would otherwise seek to develop and commercialize on its own. Furthermore, if sufficient capital is not available, the Company may be required to delay, reduce the scope of or eliminate one or more of its product initiatives. The Company's failure to raise capital or enter into applicable arrangements when needed would have a negative impact on its financial condition.

 Principles of Consolidation and Foreign Currency Transactions
 The consolidated financial statements include the accounts of International Stem Cell Corporation and its subsidiaries. All intercompany balances and transactions have been eliminated in consolidation. The functional currency of the Company and its subsidiaries, including its wholly owned Australian subsidiary, Cyto Therapeutics, is the U.S. dollar. Assets and liabilities that are not denominated in the functional currency are remeasured into U.S. dollars at foreign currency exchange rates in effect at the respective balance sheet dates. Revenue and expenses are translated at the average rate in effect on the date of the transaction. Net realized and unrealized gains and losses from foreign currency transactions and remeasurement are reported in general and administrative expense in the accompanying consolidated statements of operations and were not material for the periods presented.

 Use of Estimates
 The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying consolidated financial statements. Significant estimates include patent life (remaining legal life versus remaining useful life), allowance for excess and obsolete inventories, and stock option awards using the Black-Scholes option valuation model. Actual results could differ from those estimates.

 Segments
 The Company's chief operating decision-maker reviews financial information presented on a consolidated basis, accompanied by disaggregated information by each reportable company's statement of operations. The Company operates the business on the basis of three reporting segments, the parent company and two business units: ISCO – therapeutic market; LCT – biomedical market; and LSC – anti-aging market.

 Inventories
 Inventories are accounted for using the average cost and first-in, first-out ("FIFO") methods for LCT cell culture media and reagents, average cost and specific identification methods for LSC products, and specific identification method for other LCT products. Inventories are stated at the lower of cost or net realizable value. Laboratory supplies used in the research and development process are expensed as consumed. LCT's inventories have a long product life cycle, do not have a shelf life when frozen, and future demand is uncertain. As such, at each reporting period, the Company estimates its reserve for allowance for excess and obsolete inventory using historical sales data and inventory turnover rates. The establishment of a reserve for excess and obsolete inventory establishes a new cost basis of inventories. If the Company is able to sell such inventories, any related reserves would be reduced in the period of sale. The value of inventories that are not expected to be sold within one year of the current reporting period is classified as non-current inventories on the accompanying consolidated balance sheets.

 Accounts Receivable
 Trade accounts receivable are recorded at the net invoice value and are not interest bearing. Accounts receivable primarily consist of trade accounts receivable from the sales of LCT's products, timing of cash receipts by the Company related to LSC credit card sales to customers, as well as LSC trade receivable amounts related to spa and distributor sales. The Company measures expected credit losses for financial instruments at each reporting date based on historical experience, current conditions, and reasonable forecasts. The allowance for credit losses represents the Company's estimate of expected credit losses relating to these factors. Amounts are written off against the allowances for credit losses when the Company determines that a customer account is uncollectible. As of both December 31, 2023 and 2022, the Company's allowance for credit losses was immaterial.

 Advances
 In June 2008, the Company entered into an agreement with BioTime, Inc. ("BioTime"), whereby BioTime paid an advance of $ 250 thousand to LCT to produce, make, and distribute certain products. The $ 250 thousand advance will be paid down with the first $ 250 thousand of net revenues that otherwise would be allocated to LCT under the agreement. As of December 31, 2023, no revenues were realized and attributable to BioTime under this agreement.

 Property and Equipment
 Property and equipment are stated at cost. The provision for depreciation and amortization is computed using the straight-line method over the estimated useful lives of the assets, which are generally three to five years. Leasehold improvements are capitalized and amortized over the shorter of the remaining term of the lease or the estimated life of the assets.

 Intangible Assets
 Intangible assets consist of acquired patent licenses and capitalized legal fees related to the acquisition, filing, maintenance, and defense of patents and trademarks. Amortization begins once the patent is issued by the appropriate authoritative bodies. In the period in which a patent application is rejected or efforts to pursue the patent are abandoned, all the related accumulated costs are expensed. Patents and other intangible assets are amortized on a straight-line basis over the shorter of the useful life of the underlying patent, which is generally 15 years, or when the intangible asset is rejected or abandoned. All amortization expense and impairment charges related to intangible assets are included in general and administrative expense in the accompanying consolidated statements of operations.

 Leases
 The Company determines if an arrangement is a lease at inception. Operating leases are included in right-of-use assets, operating lease obligations, current, and operating lease obligations, net of current portion, on the Company's consolidated balance sheets.
 Right-of-use assets and lease liabilities are recognized at the lease commencement date based on the present value of future minimum lease payments over the lease term. As the Company's leases do not provide an implicit rate, the Company uses a discount rate based on its estimated incremental borrowing rate to determine the right-of-use asset and operating lease liabilities to be recognized. The Company determines its incremental borrowing rate based on the terms and lease payments of its operating leases and what it would normally pay to borrow, on a collateralized basis, over similar terms for an amount equal to the lease payments. Operating lease expense is recognized on a straight-line basis over the lease term. In addition, the Company does not separate lease components from non-lease components.

 Long-Lived Asset Impairment
 The Company reviews long-lived assets for impairment when events or changes in circumstances ("triggering event") indicate that the carrying value of an asset or group of assets may not be recovered. If a triggering event is determined to have occurred, the carrying value of an asset or group of assets is compared to the future undiscounted cash flows expected to be generated by the asset or group of assets. If the carrying value exceeds the undiscounted cash flows of the asset or group of assets, then impairment exists. Fair value is generally determined using the asset's expected future discounted cash flows or market value, if readily determinable.

 Revenue Recognition
 The Company's revenue consists primarily of sales of products from its two revenue-generating operating segments: the biomedical products market and anti-aging products market. The biomedical market segment markets and sells primary human cell research products with two product categories, cells and media, which are sold both domestically within the United States and internationally. The anti-aging market segment markets and sells a line of skincare products directly to customers through online orders via the ecommerce sales channel.

 The following table presents the Company's revenue disaggregated by segment, product and geography (in thousands, except percentages):
 Biomedical market:

 Year Ended December 31, 2023

 Total

 % of Total

 Domestic

 International

 Revenues

 Revenues

 Biomedical products

 Media

 $

 4,059

 $

 $

 4,742

 %

 Cells

 1,602

 2,124

 %

 Total

 $

 5,661

 $

 1,205

 $

 6,866

 %

 Year Ended December 31, 2022

 Total

 % of Total

 Domestic

 International

 Revenues

 Revenues

 Biomedical products

 Media

 $

 4,572

 $

 $

 5,190

 %

 Cells

 1,442

 1,941

 %

 Total

 $

 6,014

 $

 1,117

 $

 7,131

 %

 Anti-aging market:

 2023

 2022

 Skin care products

 $

 $

 1,049

 Contract terms for unit price, quantity, shipping and payment are governed by sales agreements, invoices or online order forms which the Company considers to be a customer's contract in all cases. The unit price is considered the observable stand-alone selling price for the arrangements. Any promotional or volume sales discounts are applied evenly to the units sold for purposes of calculating standalone selling price.
 The Company recognizes revenue when its customer obtains control of the promised goods or services, in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. Product sales generally consist of a single performance obligation that the Company satisfies at a point in time (i.e., upon shipment of the product).
 For LSC products, online sales and professional sales are pre-paid through credit card charges. The Company sometimes extends 15, 30, or 60-day credit terms to select professional accounts. For biomedical products, standard payment terms for its customers are generally 30 days after the Company satisfies the performance obligation(s). For LSC, the Company honors a 30-day return policy, but historical returns have been minimal and as such, no estimated allowance for sales returns was recorded as of December 31, 2023 and 2022.
 The Company accounts for shipping and handling costs, recognized as cost of sales, as activities to fulfill the promise to transfer the goods to a customer. As a result, no consideration is allocated to shipping and handling costs. Rather, the Company accrues the cost of shipping and handling upon shipment of the product, and all contract revenue (i.e., the transaction price) is recognized at the same time.
 Variable Consideration
 The Company records revenue from customers in an amount that reflects the transaction price it expects to be entitled to after transferring control of those goods or services. From time to time, the Company offers sales promotions on its skincare products such as discounts and free product offers. Variable consideration is estimated at contract inception only to the extent that it is probable that a significant reversal of revenue will not occur and updated at the end of each reporting period as additional information becomes available.

 Contract Balances
 The Company records a receivable when it has an unconditional right to receive consideration after a performance obligation is satisfied. The opening and closing balances of accounts receivable, net for the year ended December 31, 2023 was $ 747 thousand and $ 574 thousand, respectively. The opening and closing balances of accounts receivable, net for the year ended December 31, 2022 was $ 844 thousand and $ 747 thousand, respectively. For the years ended December 31, 2023 and 2022, the Company did no t incur material write-offs of its receivables.
 Practical Expedients
 The Company has elected the practical expedient to not determine whether contacts with customers contain significant financing components. The Company pays commissions on certain sales for its biomedical and anti-aging product markets once the customer payment has been received, which are accrued at the time of the sale. The Company generally expenses sales commissions when incurred because the amortization period would have been one year or less. These costs are recorded within sales and marketing expenses. In addition, the Company has elected to exclude sales taxes consideration from the determined transaction price.

 Allowance for Sales Returns
 The Company's anti-aging products have a 30 -day product return guarantee; however, the Company determined that there is a low probability that returns will occur based on its historical rate of returns. Historically, returns have not been significant and are recognized as a reduction to current period revenue. As of December 31, 2023 and 2022, the Company recorded no allowance for sales returns.

 Cost of Sales
 Cost of sales consists primarily of salaries and benefits associated with employee efforts expended directly on the production of the Company's products, as well as related direct materials, general laboratory supplies and an allocation of overhead. Certain of the Company's licensed technology agreements may require the Company to pay royalties based on the future sale of the Company's products. Such royalties will be recorded as a component of cost of sales when incurred. Additionally, milestone payments or the amortization of license fees related to developed technologies used in the Company's products will be included as a component of cost of sales to the extent that such payments become due in the future.

 Advertising
 Adverting costs are expensed as incurred and included as a component of selling and marketing costs on the accompanying consolidated statements of operations. For the years ended December 31, 2023 and 2022, advertising costs were approximately $ 204 thousand and $ 220 thousand, respectively.

 Research and Development Costs
 Research and development costs, which are expensed as incurred, primarily consist of salaries and benefits associated with research and development personnel, overhead and occupancy costs, contract services costs and amortization of license costs for technology used in research and development without alternative future uses, offset by the research and development tax credits provided by the Australian Taxation Office for qualified expenditures.
 Australian Research and Development Tax Credit
 The Company's wholly owned subsidiary, Cyto Therapeutics, conducts various research and development activities on the Company's product candidates in Australia. Under Australian tax law, the Australian Taxation Office provides for a refundable tax credit in the form of a cash refund equal to 43.5 % of qualified research and development expenditures, not to exceed established thresholds. The Australian Research and Development tax incentive program is a self-assessment process, and the Australian Government has the right to review the Company's qualifying programs and related expenditures for a period of four years. If such a review were to occur and, as a result of the review and failure of a related appeal, the qualified program and related expenditures were disqualified, the respective research and development refunds could be recalled with penalties and interest.
 The refundable tax credit does not depend on the Company's generation of future taxable income or ongoing tax status or position. Accordingly, the credit is not considered an element of income tax accounting under FASB Accounting Standards Codification ("ASC") 740 – Income Taxes. The Company uses the grant accounting model by analogy to International Accounting Standards ("IAS") 20 to account for the refundable tax credit from the Australian government. The Company recognizes the research and development tax credit

 as a reduction to research and development expense when there is reasonable assurance that the tax credit will be received, the relevant expenses have been incurred, and the amount can be reliably measured. During the year ended December 31, 2023 and 2022, the Company recognized a reduction in research and development expenses of $ 99 thousand and $ 80 thousand, respectively, within research and development expense on the accompanying consolidated statement of operations. As of December 31, 2023 and 2022, the Company recognized a research and development tax credit receivable of zero and $ 80 thousand, respectively, within prepaid expenses and other current assets on the accompanying consolidated balance sheet.
 Employee Retention Credit
 Similar to the Australian Research and Development tax credit, the Company uses the grant accounting model by analogy to IAS 20 to account for the refundable Employee Retention Tax Credit ("ERC") from the U.S. government. The Company recognized the refundable tax credit as other income when there was reasonable assurance that the tax credit will be received, the relevant expenses have been incurred, and the amount can be reliably measured. Laws and regulations concerning government programs, including the ERC, are complex and subject to varying interpretations. Claims made under these programs may also be subject to retroactive audit and review. While the Company does not believe there is a basis for estimation of an audit or recapture risk at this time, there can be no assurance that regulatory authorities will not challenge the Company's claim to the ERC in a future period. Refer to Note 8 – Employee Retention Credit within the consolidated financial statements for further discussion.

 Stock-Based Compensation
 The cost of a stock-based award is measured at the grant date based on the estimated fair value of the award, and is recognized as expense on a straight-line basis, net of forfeitures which are recognized as incurred, over the requisite service period of the award. The fair value of stock options is estimated using the Black-Scholes option valuation model, which requires the input of subjective assumptions, including price volatility of the underlying stock, risk-free interest rate, dividend yield, and expected life of the option. The Company uses the Simplified Method to estimate the term of options granted. The fair value of restricted stock awards is based on the market value of the Company's common stock on the date of grant.

 Fair Value Measurements
 The carrying amounts of the Company's accounts receivable, accounts payable, and accrued liabilities are considered to be representative of their respective fair values because of the short-term nature of those instruments. The carrying value of the Company's related party note payable does not approximate fair value. Refer to Note 10 – Related Party Transactions within the consolidated financial statements for further discussion.

 Income Taxes
 The Company uses the asset and liability method of accounting for income taxes. When the Company prepares its consolidated financial statements, it estimates income taxes based on the various jurisdictions and countries where it conducts business. This requires the Company to estimate current tax exposure and to assess temporary differences that result from differing treatments of certain items for tax and accounting purposes. Deferred income taxes are recognized based on the differences between the financial statement and income tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The Company then assesses the likelihood that deferred tax assets will be realized. Valuation allowances are established, when it is more likely than not the deferred tax assets will not be realized. When the Company establishes a valuation allowance or increases this allowance in an accounting period, it records a corresponding tax expense in the consolidated statements of operations. The Company includes interest and penalties related to income taxes within its provision for income taxes.

 Net Loss Per Share
 Basic net loss per share attributable to common stockholders is calculated by dividing the net loss attributable to common stockholders by the weighted-average number of common shares outstanding during the period. Diluted net loss per share attributable to common stockholders is computed by dividing the net income attributable to common stockholders by the weighted-average number of common stock equivalents outstanding for the period determined using the treasury and two-class or "if-converted" methods. The two-class method is not applicable during periods with a net loss, as the holders of the convertible preferred stock do not have an obligation to fund losses. Potentially dilutive common stock equivalents are comprised of stock options and convertible preferred stock. For the years ended December 31, 2023 and 2022, there was no difference in the number of shares used to calculate basic and diluted shares outstanding as the Company was in a net loss position.

 For the years ended December 31, 2023 and 2022, the following common stock options and convertible preferred stock were not included in the diluted net loss per share calculation because the effect would be anti-dilutive.

 2023

 2022

 Employee stock options

 8,590,455

 6,460,654

 Redeemable convertible preferred stock

 2,457,143

 2,457,143

 Non-redeemable convertible preferred stock

 5,061,687

 3,619,379

 Total

 16,109,285

 12,537,176

 Comprehensive Loss
 Comprehensive loss includes all changes in stockholders' deficit except those resulting from investments by owners and distributions to owners. The Company did not have any items of comprehensive loss other than net loss from operations for the years ended December 31, 2023 and 2022.

 Customer Concentrations
 For the years ended December 31, 2023 and 2022, one customer accounted for approximately 46 % and 45 %, respectively, of consolidated product sales, and approximately 52 % and 51 %, respectively, of biomedical product sales. As of December 31, 2023 and 2022, the same customer accounted for 47 % and 73 %, respectively, of accounts receivable, net.
 No other single customer accounted for more than 10% of product sales, net for the years ended December 31, 2023 and 2022 in either segment. As of December 31, 2023, three customers individually accounted for more than 10 % of accounts receivable, net and in the aggregate, accounted for 33 % of accounts receivable, net. No other single customer accounted for more than 10% of accounts receivable, net as of December 31, 2022.

 Recently Issued Accounting Pronouncements
 In August 2020, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2020-06, Debt – Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging – Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity ("ASU 2020-06"). ASU 2020-06 intends to simplify the accounting for convertible debt instruments by reducing the number of accounting models and the number of embedded features that could be recognized separately from the host contract. Among other things, the amendment allows certain convertible debt instruments to be accounted for as a single liability measured at its amortized cost, as long as no other features require bifurcation and recognition as derivatives. Further, the amendments require use of the if-converted method in the diluted earnings per share calculation for convertible instruments. The new standard will be effective for the Company on January 1, 2024. The Company is currently evaluating the potential impact that this standard may have on its consolidated financial statements and related disclosures.
 In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures ("ASU 2023-07"). ASU 2023-07 intends to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. Among other things, the amendments in ASU 2023-07 require additional information regarding significant segment expenses provided to the chief operating decision maker ("CODM"), qualitative and quantitative disclosures regarding other segment items, any additional segment profit or loss measures contemplated by the CODM when assessing segment performance, how the CODM allocates resources among segments, and the title and position of the CODM. Further, the amendments require interim segment reporting disclosures that were previously only required to be disclosed annually. ASU 2023-07 will be effective for the Company for the fiscal year ending December 31, 2024 and for interim periods beginning January 1, 2025. The Company is currently evaluating the potential impact that this standard may have on its consolidated financial statements and related disclosures.
 In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosure ("ASU 2023-09"). ASU 2023-09 intends to provide improved transparency about income tax information through improvements to income tax disclosures. Among other things, the amendments in ASU 2023-09 require enhanced disclosures regarding federal, state, and foreign income taxes primarily related to the income tax rate reconciliation and income taxes paid. Further, the amendments eliminate certain disclosure requirements related to uncertain tax positions and unrecognized deferred tax liabilities. The new standard will be effective for the Company for the fiscal year ending December 31, 2025. The Company is currently evaluating the potential impact that this standard may have on its consolidated financial statements and related disclosures.

 Recently Adopted Accounting Pronouncements
 In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"). The ASU introduced a new credit loss methodology, the Current Expected Credit Losses ("CECL") methodology, which requires earlier recognition of credit losses, while also providing additional transparency about credit risk. The CECL methodology utilizes a lifetime "expected credit loss" measurement objective for the recognition of credit losses for loans, held-to maturity debt securities, trade receivables and other receivables measured at amortized cost at the time the financial asset is originated or acquired. Subsequent to the issuance of ASU 2016-13, the FASB issued several additional ASUs to clarify implementation guidance, provide narrow-scope improvements and provide additional disclosure guidance. The Company adopted ASC 2016-13 on January 1, 2023. The adoption of this standard did no t have a material impact on the Company's consolidated financial statements.

 2. Inventories
 The components of inventories are as follows (in thousands):

 2023

 2022

 Raw materials

 $

 $

 Work in process

 Finished goods

 1,145

 1,194

 2,268

 2,307

 Less: allowance for inventory excess and obsolescence

 ( 739

)

 ( 637

)

 Total inventories

 $

 1,529

 $

 1,670

 Inventories

 $

 1,263

 $

 1,384

 Non-current inventories

 Total inventories

 $

 1,529

 $

 1,670

 As of December 31, 2023 and 2022, the allowance for inventory excess and obsolescence consists of the following activity (in thousands):

 2023

 2022

 Balance, beginning of year

 $

 $

 Provision for inventory reserve

 Write-offs

 ( 175

)

 ( 107

)

 Balance, end of year

 $

 $

 The write-offs include scrapped inventories and reserved inventories sold.

 3. Property and Equipment
 Property and equipment consist of the following (in thousands):

 2023

 2022

 Machinery and equipment

 $

 1,602

 $

 1,603

 Computer equipment and software

 Office equipment

 Leasehold improvements

 Construction in progress

 —

 2,541

 2,467

 Less: accumulated depreciation and amortization

 ( 2,326

)

 ( 2,219

)

 Property and equipment, net

 $

 $

 Depreciation and amortization expense for the years ended December 31, 2023 and 2022 was $ 112 thousand and $ 137 thousand. During the year ended December 31, 2023 and 2022, the Company disposed of approximately $ 5 thousand and $ 41 thousand, respectively, in property and equipment that had been depreciated and amortized in full and had no impact on the accompanying consolidated statements of operations.

 4. Intangible Assets
 Intangible Assets consists of the following (in thousands):

 2023

 2022

 Patents

 $

 1,290

 $

 1,286

 Less: accumulated amortization

 ( 565

)

 ( 483

)

 Indefinite life logos and trademarks

 Intangible assets, net

 $

 $

 Amortization expense for the years ended December 31, 2023 and 2022 was $ 82 thousand and $ 81 thousand, respectively. No impairment charges were recorded for the years ended December 31, 2023 and 2022.
 The timing of approval of pending patent applications is uncertain and, therefore, are included in the thereafter period below until issued. Pending patents as of December 31, 2023 and 2022 was $ 61 thousand and $ 57 thousand. As of December 31, 2023, future amortization expense related to intangible assets subject to amortization is expected to be as follows (in thousands):

 Years ending December 31,

 2024

 $

 2025

 2026

 2027

 2028

 Thereafter

 Total

 $

 5. Convertible Preferred Stock
 As of December 31, 2023 and 2022, the Company was authorized to issue 20,000,000 shares of preferred stock, $ 0.001 par value per share. The Company has designated 50 shares of Series D redeemable convertible preferred stock and as of both December 31, 2023 and 2022, a total of 10,004,310 of Series B, Series G and Series I-2 non-redeemable convertible preferred stock. The Company's Series B, Series G and Series I-2 non-redeemable convertible preferred stock has been classified as equity on the accompanying consolidated balance sheets.
 The authorized, issued and outstanding shares of non-redeemable convertible preferred stock as of December 31, 2023 consist of the following:

 Issued and

 Liquidation

 Carrying

 Authorized

 Outstanding

 Preference

 Value

 (in thousands)

 Series B

 250,000

 $

 $

 —

 Series G

 5,000

 Series I-2

 4,310

 4,310

 4,310

 —

 Total

 10,004,310

 5,254,310

 $

 9,796

 $

 The authorized, issued and outstanding shares of non-redeemable convertible preferred stock as of December 31, 2022 consist of the following:

 Issued and

 Liquidation

 Carrying

 Authorized

 Outstanding

 Preference

 Value

 (in thousands)

 Series B

 250,000

 $

 $

 —

 Series G

 5,000

 Series I-2

 4,310

 4,310

 4,310

 —

 Total

 10,004,310

 5,254,310

 $

 9,781

 $

 The significant rights and preferences of the Company's convertible preferred stock are as follows:
 Dividends
 Holders of the Company's convertible preferred stock are entitled to participating dividends with common stock when and if declared by the Company's Board of Directors. The Series D and G convertible preferred stock previously had rights to cumulative dividends in liquidation whether declared or not declared. Since the holders waived the rights to such dividends in prior years, this does not have an ongoing impact. No dividends have been declared for the year ended December 31, 2023.
 Liquidation
 Liquidation preference among classes of preferred shares is first with Series D with priority, followed by Series G, Series B and Series I-2 on the proceeds from any sale or liquidation of the Company in an amount equal to the purchase price of shares plus (in the case of the Series B) an amount equal to 1 % of the Series B original issue price for every two calendar months from February 1, 2008. Following the satisfaction of the liquidation preferences, all shares of common stock participate in any remaining distribution.
 Conversion
 The conversion rates of the Series B, Series D, and Series I-2 are subject to anti-dilution adjustments whereby, subject to specified exceptions, if the Company issues equity securities or securities convertible into equity at a price below the applicable conversion price of the Series B, Series D, and Series I-2, the conversion price of each such series shall be adjusted downward to equal the price of the new securities. The conversion rate of the Series G is subject to a weighted-average adjustment in the event of the issuance of additional shares of common stock below the conversion price, subject to specified exceptions. Upon the occurrence of an event that triggers a down round protection, the Company will recognize the value of the down round as a beneficial conversion discount. The conversion price of the Series I-2 are also subject to certain resets as set forth in the Certificates of Designation, including a reverse stock split.
 The following table summarizes the number of shares of common stock into which each share of convertible preferred stock can be converted as of December 31, 2023:

 Conversion

 Initial

 Current

 Ratio to

 Conversion

 Conversion

 Common

 Price

 Price

 Stock

 Series B

 $

 75.00

 $

 0.12

 8.33

 Series D

 $

 37.50

 $

 1.75

 57,142.86

 Series G

 $

 60.00

 $

 9.69

 0.10

 Series I-2

 $

 1.75

 $

 1.75

 571.43

 Voting
 The holders of Series B, Series D, and Series G are entitled to one vote for each share of common stock into which it would convert. As long as there are at least 10 shares of Series D outstanding, the holders of Series D have (i) the right to nominate and elect two members of the Board of Directors, and (ii) the right to approve specified significant transactions affecting the Company. As long as there are at least 1,000,000 shares of Series G outstanding, the holders of Series G have the initial right to propose the nomination of two members of the Board, at least one of which such nominees shall be subject to the approval of the Company's independent directors, for election by the stockholders at the Company's next annual meeting of stockholders, or, elected by the full board of directors to fill a

 vacancy, as the case may be. At least one of the two directors nominated by holders of the Series G shall be independent. The holder of Series I-2 has no voting rights, except as required by law.
 Series D Preferred Stock Redemption
 The Company's Series D redeemable convertible preferred stock contains a contingent redemption feature that is not solely within the Company's control. Accordingly, the Series D redeemable convertible preferred stock is classified in temporary equity (outside of permanent equity) on the accompanying consolidated balance sheets.

 6. Stockholders' Deficit
 Common Stock
 As of December 31, 2023, the Company was authorized to issue 120,000,000 shares of common stock, $ 0.001 par value per share.
 Common Stock Reserved for Future Issuance
 As of December 31, 2023, the Company had shares of common stock reserved for future issuance as follows:

 Options outstanding

 11,807,494

 Common stock available for issuance under the 2010 Plan

 18,025,564

 Redeemable convertible preferred stock

 2,457,143

 Non-redeemable convertible preferred stock

 5,061,687

 Total

 37,351,888

 7. Equity Incentive Plans
 The Company adopted the 2006 Equity Participation Plan (as amended, the "2006 Plan"), which provides for the grant of stock options, restricted stock and other equity-based awards. Awards for up to 100,000 shares may be granted to employees, directors and consultants under this Plan. The options granted under the 2006 Plan may be either qualified or non-qualified options. Options may be granted with different vesting terms and expire no later than 10 years from the date of grant. The 2006 Plan expired on November 16, 2016. Options and other equity-based awards granted prior to the expiration of the 2006 Plan will continue in effect until the option or award is exercised or terminates pursuant to its terms. No new awards may be granted under the 2006 Plan following its expiration.
 In April 2010, the Company adopted the 2010 Equity Participation Plan, as amended ("2010 Plan"), which provides for the grant of stock options, restricted stock and other equity-based awards. Awards for up to 9,700,000 shares may be granted to employees, directors and consultants under the 2010 Plan. The options granted under the 2010 Plan may be either qualified or non-qualified options. Options may be granted with different vesting terms and expire no later than 10 years from the date of grant.
 In June 2020, the Company amended the 2010 Plan to extend the term of the 2010 Plan until March 2030. No other material provisions were amended.
 In September 2023, the Company's Board of Directors voted to amend the 2010 Plan ("2010 Plan Amendment") to 1) increase the number of shares that may be issued under the 2010 Plan from 9,700,000 shares to an aggregate of 30,000,000 shares of common stock and 2) increase the number of awards an employee may receive in a calendar year from 800,000 shares to 10,000,000 shares. The majority shareholders approved the 2010 Plan Amendment on September 21, 2023 and the Company filed the Notice of Internet Availability of Information Statement (the "Notice") on September 27, 2023, noting the 2010 Plan Amendment would become effective no earlier than 40 calendar days after the Notice was first made available to shareholders. Accordingly, on November 6, 2023, the 2010 Plan Amendment became effective.
 For the year ended December 31, 2023, there were no restricted stock units granted. As of December 31, 2023, there were no restricted stock units outstanding.
 Stock Options
 Transactions involving stock options issued to employees, directors and consultants under the 2006 Plan and the 2010 Plan are summarized below. Options issued have a maximum life of 10 years and no options were exercised in the years ended December 31,

 2023 and 2022. The following tables summarize the changes in options outstanding and the related exercise prices for the Company's common stock options issued:

 Average

 Weighted-

 Remaining

 Aggregate

 Number of

 Average

 Contractual

 Intrinsic

 Outstanding

 Exercise

 Term

 Value

 Options

 Price

 (in years)

 (in thousands)

 Outstanding at December 31, 2022

 6,858,492

 $

 1.02

 Granted

 4,950,410

 $

 0.13

 Expired

 ( 1,408

)

 $

 39.98

 Outstanding at December 31, 2023

 11,807,494

 $

 0.64

 7.75

 $

 —

 Vested and expected to vest at December 31, 2023

 11,213,305

 $

 0.67

 7.66

 $

 —

 Exercisable at December 31, 2023

 6,482,569

 $

 1.01

 6.41

 $

 —

 Stock-Based Compensation
 The weighted-average assumptions used in the Black-Scholes option valuation model to determine the fair value of stock options grants for the years ended December 31, 2023 and 2022 were as follows:

 2023

 2022

 Risk-free interest rate

 4.28 %

 2.86 %

 Expected stock price volatility

 91.50 %

 90.29 %

 Expected dividend yield

 0 %

 0 %

 Expected life of options (in years)

 5.69

 5.71

 Weighted-average grant date fair value

 $ 0.10

 $ 0.33

 Total stock-based compensation expense for the years ended December 31, 2023 and 2022 was comprised of the following (in thousands):

 2023

 2022

 Cost of sales

 $

 $

 General and administrative

 Selling and marketing

 Research and development

 Total

 $

 $

 Unrecognized compensation expense related to stock options as of December 31, 2023 was $ 650 thousand, which is expected to be recognized over a weighted-average period of approximately 1.84 years.

 8. Employee Retention Credit
 Other income is primarily attributable to the one-time receipt of the Employee Retention Tax Credit from the Internal Revenue Service (the "IRS"). As a response to the COVID-19 outbreak, the U.S. government enacted the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act"), which contained a number of programs to assist workers, families and businesses. Part of the CARES Act provides an Employee Retention Credit ("ERC"), which is a refundable tax credit against certain employment taxes equal to 50 % of qualified wages paid, up to $ 10,000 per employee annually, from March 12, 2020 through January 1, 2021. Additional relief provisions were passed by the United States government, which extended and expanded the qualified wage caps on these credits to 70 % of qualified wages paid through June 30, 2021 and 100 % of qualified wages paid through December 31, 2021, up to $ 10,000 per employee per quarter.
 In January 2023, the Company filed Form 941-X for the three months ended March 31, June 30 and September 30, 2021 to claim a refund for the ERC. The Company elected to account for the ERC under IAS 20 when there was reasonable assurance of receipt, which was determined to be when the notification of acceptance of Form 941-X was received by the IRS. In June 2023, the Company received confirmation from the IRS that changes to the Company's Q1, Q2 and Q3 941 forms amounting to $ 224 thousand in the first quarter of 2021, $ 238 thousand in the second quarter of 2021, and $ 201 thousand in the third quarter of 2021 had been accepted. The Company

 received payment from the IRS related to the ERC during the second quarter of 2023 and recorded other income of $ 663 thousand in the accompanying consolidated statement of operations.

 9. Income Taxes
 Pre-tax loss consists of the following jurisdictions (in thousands):

 2023

 2022

 Domestic pre-tax book loss

 $

 ( 76

)

 $

 ( 228

)

 Foreign pre-tax book loss

 ( 55

)

 ( 103

)

 Consolidated pre-tax book loss

 $

 ( 131

)

 $

 ( 331

)

 A reconciliation of the statutory federal income tax rate and the effective income tax rate for the years ended December 31, 2023 and 2022 is as follows:

 2023

 2022

 Statutory federal income tax rate

 21.0

 %

 21.0

 %

 State income taxes, net of federal taxes

 ( 68.0

 %)

 ( 8.5

 %)

 Foreign rate differentials

 41.3

 %

 0.8

 %

 Permanent items

 ( 9.2

 %)

 ( 5.1

 %)

 Change in valuation allowance

 11,815.8

 %

 190.7

 %

 Research and development tax credits limitation

 ( 1,241.0

 %)

 0.0

 %

 Employee retention credit income

 104.5

 %

 0.0

 %

 ( 226.9

 %)

 8.0

 %

 Adjustments to NOL

 ( 10,830.5

 %)

 ( 40.6

 %)

 ASC 740-10 adjustments

 402.0

 %

 ( 170.0

 %)

 Other

 ( 9.0

 %)

 3.7

 %

 Effective income tax rate

 0.0

 %

 0.0

 %

 The Company files income tax returns in the U.S. federal jurisdiction, and various states. With few exceptions, the Company is no longer subject to U.S. federal, state, and local income tax examinations by tax authorities for years before 2017. The Company follows the provisions of FASB ASC 740-10 – Accounting for Uncertainty in Income Taxes. ASC 740-10 prescribes a comprehensive model for the recognition, measurement, presentation and disclosure in consolidated financial statements of uncertain tax positions that have been taken or are expected to be taken on a tax return.
 As of December 31, 2023 and 2022, the Company's reserve for unrecognized tax benefits was approximately $ 478 thousand and $ 953 thousand, respectively. Due to the full valuation allowance as of December 31, 2023, current adjustments to the unrecognized tax benefits will have no impact on the Company's effective tax rate. The Company does not anticipate any significant changes in its unrecognized tax benefits within 12 months of this reporting date. For the years ended December 31, 2023 and 2022, there were no penalties or interest recognized related to unrecognized tax benefits given the Company's historical loss position and full valuation allowance.
 A reconciliation of the reserve for unrecognized tax benefits is as follows (in thousands):

 Balance as of December 31, 2021

 $

 —

 Increase (decrease) related to prior year tax positions

 Increase (decrease) related to current year tax positions

 —

 Increase (decrease) related to settlements with taxing authorities

 —

 Increase (decrease) related to lapse in statute of limitations

 —

 Balance as of December 31, 2022

 Increase (decrease) related to prior year tax positions

 ( 475

)

 Increase (decrease) related to current year tax positions

 —

 Increase (decrease) related to settlements with taxing authorities

 —

 Increase (decrease) related to lapse in statute of limitations

 —

 Balance as of December 31, 2023

 $

 As of December 31, 2023, the Company has available federal net operating loss ("NOL") carryforwards of approximately $ 20.3 million, which may be applied against future taxable income and will expire in various years beginning 2026 through 2037. However, any NOL carryforwards generated in 2018 and future tax years will not expire and are carried forward indefinitely. State NOL carryforwards will start to expire in 2036. As of December 31, 2022, the Company had federal NOL carryforwards of approximately $ 73.5 million. The decrease in federal NOL carryforwards for the year ended December 31, 2023 is approximately $ 53.2 million, which is primarily attributable to the Internal Revenue Code ("IRC") Section 382 limitation. As of December 31, 2023, the Company has Australian NOL carryforwards of approximately $ 1.0 million, which may be carried forward indefinitely.
 The amount of and ultimate realization of the benefits from NOL carryforwards for income tax purposes is dependent, in part, upon the tax laws in effect, the future earnings of the Company, and other future events, the effects of which cannot be determined at this time. Because of the uncertainty surrounding the realization of NOL carryforwards, the Company has established a valuation allowance equal to the tax effect of the NOL carryforwards, research and development ("R&D") credits, and accruals; therefore, no net deferred tax asset has been recognized as of December 31, 2023.
 The Company is subject to IRC Sections 382 and 383, which limits the amount of NOL and tax credit carryovers that can be used in future years. The Company has completed a study to assess whether an ownership change has occurred, as defined by IRC Sections 382 and 383, or whether there have been ownership changes since the Company's formation. Based on the completed study, it was determined that the Company had significant ownership changes that occurred in January 2009 and November 2015. As a result of the ownership changes, under IRC Sections 382 and 383, the NOL and R&D tax credit carryforwards that were generated in the year prior to November 2015 have been significantly limited and a substantial unused amount will expire. The Company estimates that if another future change in ownership did occur, the federal and state NOL and R&D tax credit carryforwards that can be utilized in the future would be significantly limited as well. There can be no assurance that the Company will ever be able to realize the benefit of some or all of the federal and state NOL and R&D tax credit carryforwards, either due to ongoing operating losses or significant ownership change limitations.
 Significant components of deferred tax assets and liabilities are as follows (in thousands):

 2023

 2022

 Deferred tax assets:

 Net operating loss carryforwards

 $

 5,476

 $

 19,266

 Research and development tax credits

 1,993

 1,252

 IRC Section 174 costs

 Intangibles

 Lease liabilities

 Accrued expenses

 Deferred tax assets

 8,015

 23,149

 Less: valuation allowance

 ( 7,858

)

 ( 22,936

)

 Net deferred tax assets

 Deferred tax liabilities:

 Right-of-use assets

 ( 125

)

 ( 171

)

 Depreciation

 ( 32

)

 ( 42

)

 Total deferred tax liabilities

 ( 157

)

 ( 213

)

 Net deferred tax assets

 $

 —

 $

 —

 10. Related Party Transactions
 Related party lease agreements
 On October 26, 2021, the Company and S Real Estate Holdings, LLC jointly entered into a lease agreement with Rehco Holdings, LLC (the "Lease"), for the purpose of establishing a new corporate headquarters, including corporate, R&D, and manufacturing operations. S Real Estate Holdings LLC is owned by Dr. Russell Kern, the Company's Executive Vice President and Chief Scientific Officer. The lease agreement was approved by the Board of Directors and was reviewed by the Company's outside legal counsel. The terms of the lease were reviewed by a committee of independent directors, and the Company believes that, in total, those terms are at least as favorable to the Company as could be obtained for comparable facilities from an unaffiliated party. The Lease was personally guaranteed by the Dr. Russell Kern, the Company's Executive Vice President and Chief Scientific Officer.

 On December 15, 2021, the Company and S Real Estate Holdings LLC entered into a co-tenant agreement, whereby the Company and S Real Estate Holdings LLC agreed to allocate portions of the base rent and variable charges, including insurance, maintenance costs, taxes and operating expenses, between the parties. During the term of the Lease, the Company will be liable for 40 % of all costs incurred in connection with the Lease, while S Real Estate Holdings LLC will be liable for the remaining 60 %.
 Refer to Note 11 – Commitments & Contingencies within the consolidated financial statements for further discussion.
 Related party note payable
 Between March 2018 and March 2021, to obtain funding for working capital purposes, the Company borrowed a total of $ 2.7 million from Dr. Semechkin and issued an unsecured, non-convertible promissory note in the principal amount of $ 2.7 million (the "Note") to Dr. Semechkin. The outstanding principal amount under the Note accrued interest at a rate of 4.5 % per annum. The outstanding principal and accrued interest on the Note were due and payable on January 15, 2022 and could be pre-paid without penalty at any time.
 In January 2022, to obtain additional funding for working capital purposes, the Company further modified the Note and issued an unsecured, non-convertible promissory note (the "January 2022 Note") in the amount of $ 2.9 million to Dr. Semechkin. In exchange, Dr. Semechkin surrendered the Note and provided additional funding in the amount of $ 250 thousand to the Company. The outstanding principal amount under the January 2022 Note accrues interest at a rate of 4.5 % per annum. The outstanding principal and accrued interest on the January 2022 Note were due and payable on March 15, 2022 and may be pre-paid by the Company without penalty at any time.
 In March 2022, the Noteholder surrendered the January 2022 Note, and the Company issued a new promissory note ("March 2022 Note"), which featured all the same terms as the previously outstanding note, with the exception of an extension of the maturity date from March 15, 2022 to September 15, 2022. The March 2022 Note has a principal balance of $ 2.9 million, an interest rate of 4.5 %, and features optional prepayment terms. There were no debt issuance fees associated with this issuance.
 In September 2022, the Noteholder surrendered the March 2022 Note, and the Company issued a new promissory note ("September 2022 Note"), which featured all the same terms as the previously outstanding note, with the exception of an extension of the maturity date from September 15, 2022 to March 15, 2023. The September 2022 Note has a principal balance of $ 2.9 million, an interest rate of 4.5 %, and features optional prepayment terms. There were no debt issuance fees associated with this issuance.
 In March 2023, the Noteholder surrendered the September 2022 Note, and the Company issued a new promissory note ("March 2023 Note"), which featured all the same terms as the previously outstanding note, with the exception of an extension of the maturity date from March 15, 2023 to September 15, 2023. The March 2023 Note has a principal balance of $ 2.9 million, an interest rate of 4.5 %, and features optional prepayment terms. There were no debt issuance fees associated with this issuance.
 In September 2023, the Noteholder surrendered the March 2023 Note, and the Company issued a new promissory note ("September 2023 Note"), which featured all the same terms as the previously outstanding note, with the exception of an extension of the maturity date from September 15, 2023 to September 15, 2024. The September 2023 Note has a principal balance of $ 2.9 million, accrues interest at 4.5 % per annum from the original borrowing date, and features optional prepayment terms. There were no debt issuance fees associated with this issuance.
 All amendments during the years ended December 31, 2023 and 2022 qualified as troubled debt restructurings, which did not result in a gain as the carrying amount of the debt was less than the total future cash payments of the restructured debt.

 11. Commitments and Contingencies
 Leases
 As of December 31, 2023, the Company has three operating leases for real estate in California and Maryland:
 • San Diego, California – corporate headquarters, including corporate, R&D, and manufacturing operations, with a term date of December 2026, jointly leased with a related party (refer to Note 10 – Related Party Transactions within the consolidated financial statements for further discussion);

 • San Diego, California – supplemental office space adjacent to the Company's corporate headquarters with a term date of December 2026; and

 • Frederick, Maryland – mixed laboratory and administrative space with a term date of November 2025.

 In October 2021, the Company entered into an operating lease for its new corporate headquarters. The lease commenced in November 2021 and expires on December 31, 2026. At commencement, base rent due under the lease was approximately $ 11 thousand and increases approximately 3.5 % per annum over the lease term. The lease is subject to additional variable charges, including insurance, maintenance costs, taxes and operating expenses. Base rent and additional variable charges are shared between the Company and S Real Estate Holdings LLC, a related party, with base rent for months two through five of the lease term abated by 50 %. At lease commencement, the Company recognized a right-of-use asset and lease liabilities of approximately $ 232 thousand.
 In November 2021, the Company entered into an operating lease for supplemental office space adjacent to its new corporate headquarters with the same landlord. The lease commenced in December 2021 and expires on December 31, 2026, and is not subject to the co-tenant agreement with S Real Estate Holdings, LLC. At commencement, base rent due under the supplemental office lease was approximately $ 4 thousand per month and increases at a fixed amount per annum over the lease term. At lease commencement, the Company recognized a right-of-use asset and lease liabilities of approximately $ 247 thousand.
 The Company's operating leases for real estate are subject to additional variable charges for common area maintenance and other variable costs, and do not include an option to extend the lease term. As of December 31, 2023, total right-of-use assets and operating lease liabilities were approximately $ 557 thousand and $ 721 thousand, respectively. As of December 31, 2023, the Company had no finance leases.
 Information related to the Company's right-of-use assets and related lease liabilities were as follows (in thousands, except years and percentages):

 2023

 2022

 Operating lease costs

 $

 $

 Short-term lease costs

 Variable lease costs

 Total lease costs

 $

 $

 Cash paid for amounts included in measurement of lease liabilities

 $

 $

 Weighted-average remaining lease term (years)

 2.44

 3.43

 Weighted-average discount rate

 13.20

 %

 13.38

 %

 Maturities of lease liabilities as of December 31, 2023 were as follows (in thousands):

 Years ending December 31,

 2024

 $

 2025

 2026

 Total minimum lease payments

 Less: imputed interest

 ( 107

)

 Total future minimum lease payments

 Less: operating lease liabilities, current

 ( 276

)

 Operating lease liabilities, net of current portion

 $

 Licensed Patents
 The Company had a minimum annual license fee of $ 75 thousand payable in two installments per year to Astellas Pharma pursuant to the amended UMass IP license agreement. The patents, along with the license agreement, expired at the end of July 2022. These patents were fully impaired in prior years and, therefore, the expiration did not result in any impairment for the year ended December 31, 2022. The Company does not anticipate any short-term liquidity effects from this obligation as they will no longer be liable for the annual licensing fee.

 12. Segments and Geographic Information
 The Company operates the business on the basis of three reporting segments, the parent company and two business units: ISCO – therapeutic market; LCT – biomedical market; and LSC – anti-aging market.

 The Company does not measure the performance of its segments on any asset-based metrics. Therefore, segment information is presented only for net loss. Results of operations by market segment were as follows (in thousands):

 2023

 2022

 Revenues:

 $

 6,866

 $

 7,131

 1,049

 Total revenues

 7,789

 8,180

 Operating expenses:

 Therapeutic market

 2,518

 2,369

 4,492

 4,384

 1,442

 1,610

 Total operating expenses

 8,452

 8,363

 Operating income (loss):

 Therapeutic market

 ( 2,518

)

 ( 2,369

)

 2,374

 2,747

 ( 519

)

 ( 561

)

 Total operating loss

 ( 663

)

 ( 183

)

 Other income (expense), net:

 Therapeutic market

 ( 135

)

 —

 ( 8

)

 —

 ( 5

)

 Total other income (expense), net

 ( 148

)

 Net income (loss):

 Therapeutic market

 ( 1,986

)

 ( 2,504

)

 2,374

 2,739

 ( 519

)

 ( 566

)

 Total net loss

 $

 ( 131

)

 $

 ( 331

)

 Geographic Information
 The Company's wholly owned subsidiaries are located in Maryland, California and Melbourne, Australia, and have customer and vendor relationships worldwide. The Company's long-lived assets including property, plant, and equipment, net, right-of-use assets, and intangible assets, net are domiciled in the United States. Significant revenues in the following regions are those that are attributable to the individual country within the region to which the product was shipped were as follows (in thousands):

 2023

 2022

 United States

 $

 6,548

 $

 7,016

 Asia

 Europe

 All other regions

 Total

 $

 7,789

 $

 8,180