Table 1.

Defining Characteristics of Donor Cell Populations

Source	•  Autologous: patient-derived•  Allogeneic: donor-derived (potentially HLA-matched and/or genetically engineered)
Potential	•  Pluripotent: capable of forming cells from all three germ layers (e.g. human ES or iPS cell)•  Multipotent: capable of forming a limited range of cell types from a common lineage (e.g. retinal progenitor cell)•  Unipotent: capable of forming one cell type or class (e.g. photoreceptor precursor)
Purity	•  Heterogenous: the cell product consists of the target cell type intermixed with multiple off-target cell types•  Enriched: the cell product is predominantly comprised of the target cell type•  Purified: the cell product is exclusively comprised of the target cell type