Cell & Gene Therapy Glossary
A comprehensive reference of terms used in cell therapy, gene therapy, and starting material procurement. This glossary covers key concepts relevant to researchers, clinical teams, and procurement professionals working with cell-based therapeutics.
A
Allogeneic
Derived from a donor who is genetically different from the recipient. Allogeneic cell therapies use cells from healthy donors rather than the patient, enabling off-the-shelf manufacturing. OrganaBio provides allogeneic starting materials including cord blood-derived NK cells and T cells.
Apheresis
A procedure that separates specific blood components (such as white blood cells) from a donor’s blood, returning the remaining components to the donor. Leukapheresis specifically collects leukocytes. OrganaBio’s subsidiary HemaCenter operates FDA-registered apheresis collection centers.
Autologous
Derived from the patient’s own cells. Autologous cell therapies require collecting cells from each individual patient, processing them, and returning them to the same patient. Fresh leukopaks are commonly used as starting material for autologous CAR-T manufacturing.
B
Biopreservation
The process of preserving biological materials for future use while maintaining cell viability and function. Includes cryopreservation (freezing) and hypothermic storage (cold but not frozen).
B Cells
A class of lymphocytes identified by expression of CD19 and CD20, responsible for humoral immunity through antibody production. Subsets include naïve, memory, plasmablast, and plasma cells. OrganaBio offers primary human B cells isolated from peripheral blood leukopaks.
Buffy Coat
The fraction of a centrifuged blood sample containing white blood cells and platelets, located between the plasma and red blood cell layers. A less concentrated alternative to a leukopak for PBMC isolation.
C
CAR-T (Chimeric Antigen Receptor T Cell)
A type of immunotherapy where a patient’s or donor’s T cells are genetically modified to express a chimeric antigen receptor that targets specific cancer cells. CAR-T manufacturing requires high-quality T cell starting materials, typically from leukopaks.
CAR-NK (Chimeric Antigen Receptor Natural Killer Cell)
Similar to CAR-T but using NK cells as the effector cell. Cord blood-derived NK cells are increasingly used for CAR-NK development because of their naive phenotype and amenability to genetic modification.
CD3+
A cell surface marker present on all T lymphocytes. CD3+ selection is used to isolate pan T cells from blood products. OrganaBio’s LeukoPAC-T and ImmunoPAC-T products provide CD3+ T cells.
CD34+
A cell surface marker for hematopoietic stem and progenitor cells. CD34+ cells are used in transplantation, gene therapy, and regenerative medicine research. OrganaBio’s HematoPAC-HSC provides CD34+ cells from cord blood.
CD56+
A cell surface marker for natural killer (NK) cells. CD56+ selection is used to isolate NK cell populations for immunotherapy research and CAR-NK development.
Cell Viability
The percentage of living cells in a sample. Higher viability indicates better quality starting material and improved downstream results. OrganaBio achieves 99.1% average cell viability through co-located collection and processing (under 30 minutes from draw to processing).
cGMP (Current Good Manufacturing Practice)
FDA-enforced regulations ensuring pharmaceutical and biologic products are consistently produced and controlled according to quality standards. OrganaBio operates cGMP manufacturing facilities with ISO 7 cleanrooms.
Chain of Custody
The documented, unbroken tracking of biological materials from collection through processing, storage, and delivery. Vertical integration allows OrganaBio to maintain chain of custody from donor consent through final product delivery.
Co-location
The practice of placing collection and processing facilities in close physical proximity to minimize transit time. OrganaBio’s collection centers and processing labs share a parking lot, enabling processing within 30 minutes of collection rather than the 18-36 hours typical of overnight shipping.
Cord Blood
Blood collected from the umbilical cord and placenta after birth. Cord blood contains hematopoietic stem cells, naive T cells, and NK cells with unique properties valuable for cell therapy. OrganaBio collects cord blood through its subsidiary GaiaGift.
Cryopreservation
The process of preserving cells by cooling them to very low temperatures (typically in liquid nitrogen at -196C). Validated cryopreservation protocols maintain cell viability and function for long-term storage.
CTDMO (Contract Technology Development and Manufacturing Organization)
An organization that provides both process development and manufacturing services for cell and gene therapy products. OrganaBio operates as a purpose-built CTDMO, distinguishing itself from general contract labs.
CAR-M
Chimeric antigen receptor macrophage therapy, an emerging modality in which macrophages are engineered to target solid tumors through phagocytosis and antigen presentation. OrganaBio supplies primary human macrophages used as starting material in CAR-M development.
Certificate of Analysis (CoA)
A quality document issued by a manufacturer that lists the test results for a specific lot of product against predefined acceptance criteria. Required for GMP starting materials and standard for OrganaBio products. OrganaBio CoAs include 8-color immunophenotyping, high-resolution HLA typing across six genes, and CBC data on the donor and final product.
Chain of Identity (CoI)
Documentation that links the identity of the donor, the starting material, and the final product across the entire manufacturing lifecycle. Required for autologous therapies and recommended for allogeneic products. Distinct from Chain of Custody, which tracks physical handling.
Cold Chain
The logistics system that maintains cells or biological products within a specified temperature range from collection through delivery. For fresh leukopaks, typically 2-8°C ambient-controlled shipping; for frozen products, vapor-phase liquid nitrogen dry shippers with continuous temperature monitoring.
Comparability Study
A formal study demonstrating that a change in manufacturing process, facility, or starting material does not adversely affect the quality, safety, or efficacy of a biological product. ICH Q5E provides the regulatory framework. OrganaBio supports comparability studies through donor-matched RUO and GMP material from the same recallable donor pool.
Controlled-Rate Freezing
A cryopreservation method in which the cooling rate is controlled to a defined profile, typically around 1°C per minute through the phase transition, to minimize ice-crystal damage and maximize post-thaw viability. Standard for GMP-grade cryopreserved cell products.
Critical Quality Attribute (CQA)
A physical, chemical, biological, or microbiological property that must be within an appropriate range to ensure product quality. Identified through quality by design (QbD) methodology and codified in ICH Q8.
Cross-Reactive Idiotype (CRM)
Context-dependent term in immunology referring to reactivity patterns that may confound donor matching in T cell therapy programs. Relevant where high-resolution HLA typing and TCR characterization are required.
D
Donor Recallability
The ability to recall the same qualified donor for repeat collections over time. Recallable donors ensure batch-to-batch consistency by providing the same biological starting material across R&D and clinical manufacturing. OrganaBio maintains 1,000+ recallable donors.
Dendritic Cells
Antigen-presenting cells of myeloid or lymphoid origin, critical for initiating adaptive immune responses. Subsets include conventional (cDC1, cDC2) and plasmacytoid (pDC) dendritic cells. Used in immunotherapy research and vaccine development.
Donor Eligibility Determination
A documented determination under 21 CFR 1271.50 that a donor has been screened and tested in accordance with applicable requirements and is eligible as a source of cells or tissues for use in humans. Required for all OrganaBio GMP-tier products.
E
Engraftment
The process by which transplanted cells establish themselves and begin functioning in the recipient’s body. Successful engraftment is a primary endpoint in stem cell transplantation.
F
Flow Cytometry
A laboratory technique that measures physical and chemical characteristics of cells as they flow through a laser. Used for immunophenotyping, cell counting, and quality control of cell therapy products. OrganaBio offers up to 25-color flow cytometry analysis.
FDA Regulation 21 CFR 1271
The US regulation governing human cells, tissues, and cellular and tissue-based products (HCT/Ps). Covers donor eligibility, current good tissue practice (CGTP), establishment registration, and adverse-event reporting. OrganaBio’s quality system is built to 21 CFR 1271 across both RUO and GMP product tiers.
G
GMP-Grade
Materials manufactured under cGMP conditions suitable for use in clinical trials and commercial therapies. GMP-grade starting materials require documented processes, qualified facilities, and regulatory compliance.
H
HLA (Human Leukocyte Antigen)
Proteins on cell surfaces that play a critical role in immune recognition. HLA typing is essential for donor-recipient matching in transplantation and for selecting appropriate donors for allogeneic cell therapy. OrganaBio provides high-resolution HLA typing using next-generation sequencing at 6 loci (A, B, C, DR, DQ, DP).
I
Immunophenotyping
The characterization of cells using antibodies that recognize specific surface markers. Used to identify cell types, assess purity, and verify product quality in cell therapy manufacturing.
IRB (Institutional Review Board)
An ethics committee that reviews and approves research involving human subjects. All donor collections at OrganaBio are conducted under IRB-approved protocols with informed consent.
iPSC (Induced Pluripotent Stem Cell)
A pluripotent stem cell generated by reprogramming somatic cells through defined transcription factors (originally Oct4, Sox2, Klf4, c-Myc). Used as a scalable source for differentiated cell types in allogeneic cell therapy programs.
K
KIR (Killer-cell Immunoglobulin-like Receptor)
A family of receptors expressed on NK cells that regulate their activation through interaction with HLA class I ligands. KIR-ligand mismatching is relevant to allogeneic NK cell therapy and CAR-NK program design.
L
Leukopak
A concentrated collection of white blood cells obtained via leukapheresis. Leukopaks contain T cells, B cells, NK cells, and monocytes and serve as the primary starting material for many cell therapies. OrganaBio’s LeukoPAC products are available fresh or cryopreserved.
M
MSC (Mesenchymal Stem/Stromal Cell)
Multipotent cells that can differentiate into bone, cartilage, and fat cells. MSCs also secrete anti-inflammatory and immunomodulatory factors. OrganaBio’s MesenPAC products provide MSCs from umbilical cord tissue and placental tissue.
Macrophages
Tissue-resident or monocyte-derived phagocytic cells with roles in innate immunity, tissue remodeling, and immune regulation. In vitro, human macrophages are typically differentiated from monocytes using M-CSF or GM-CSF over 5-7 days. OrganaBio supplies primary human macrophages pre-differentiated to defined polarization states (M0, M1, M2).
Monocytes
Circulating myeloid cells identified by CD14 expression, subdivided into classical (CD14++CD16-), intermediate (CD14++CD16+), and non-classical (CD14+CD16++) populations. Precursors to tissue macrophages and dendritic cells. OrganaBio supplies CD14+ monocytes isolated from peripheral blood leukopaks.
N
NK Cell (Natural Killer Cell)
A type of lymphocyte that plays a role in innate immunity by killing virus-infected and cancerous cells. NK cells are increasingly used in cancer immunotherapy, particularly CAR-NK approaches. Cord blood NK cells have advantages including naive phenotype and amenability to genetic modification.
P
PBMC (Peripheral Blood Mononuclear Cell)
A collective term for blood cells with a round nucleus, including lymphocytes (T cells, B cells, NK cells) and monocytes. PBMCs are isolated from whole blood or leukopaks and used extensively in immunology research and clinical monitoring.
Process Development
The systematic optimization of manufacturing processes to achieve robustness, reproducibility, and scalability. OrganaBio offers process development services using equipment including CliniMACS Prodigy, AutoMACS, and Sepax systems.
Placental Tissue
Perinatal tissue obtained at full-term birth, used as a source of mesenchymal stromal cells and extracellular matrix products for research and clinical applications. OrganaBio’s MesenPAC-MSC-PL is derived from ethically consented placental tissue.
Post-Thaw Viability
The percentage of viable cells remaining after a cryopreserved product is thawed using a defined protocol. A standard release criterion on Certificates of Analysis for frozen cell products and a primary determinant of downstream assay quality.
Potency Assay
A quantitative measure of the biological activity of a cell therapy product, required for lot release. For cell therapies, potency assays often measure cytotoxicity, cytokine release, or surface marker function depending on the mechanism of action.
R
RUO (Research Use Only)
Products intended for laboratory research purposes only, not for use in diagnostic procedures or therapeutic applications. RUO products have fewer regulatory requirements than GMP-grade materials but must still meet quality standards.
RUO-to-GMP Transition
The progression from research-grade to clinical-grade materials during the development of a cell therapy. OrganaBio enables seamless RUO-to-GMP transition by using the same donors, SOPs, and team from early research through clinical manufacturing.
S
Starting Material
The biological raw material from which a cell therapy product is manufactured. Common starting materials include leukopaks, cord blood units, and tissue-derived cells. The quality of starting material directly impacts the quality and consistency of the final product.
T
T Cell
A type of lymphocyte central to adaptive immunity. T cells are the basis for CAR-T therapy and play essential roles in immune responses. Different T cell subsets (CD4+ helper, CD8+ cytotoxic) serve different functions.
Tissue Collection
The procurement of biological tissues (such as umbilical cord, placenta, and cord blood) from consenting donors. OrganaBio’s subsidiary GaiaGift manages tissue collection through partnerships with hospitals and OB/GYN practices.
TCR Engineering
A cell therapy modality in which T cells are engineered to express a defined T cell receptor that recognizes a tumor-associated peptide presented by HLA. Requires HLA-matched patients and high-resolution HLA typing of starting material across HLA-A, -B, -C, -DRB1, -DQB1, and -DPB1.
Tregs (Regulatory T Cells)
A subset of CD4+ T cells characterized by high CD25 and FOXP3 expression, responsible for immune tolerance and suppression of autoreactive responses. Used in autoimmune disease therapy development and graft-versus-host disease research.
U
Umbilical Cord Tissue
The structural tissue of the umbilical cord, primarily Wharton’s jelly, used as a source of mesenchymal stromal cells. Collected at birth under IRB-approved consent and processed into tissue-derived MSC products. OrganaBio’s MesenPAC-MSC-UC is derived from umbilical cord tissue collected through the GaiaGift subsidiary.
V
Vertical Integration
A business model where a company owns and operates multiple stages of its supply chain. OrganaBio is vertically integrated from donor recruitment (HemaCenter, GaiaGift) through collection, processing, manufacturing, analytical testing, and logistics, maintaining a single chain of custody and quality system throughout.