Cryopreserved Normal Human Epidermal Keratinocytes from pooled donros are guaranteed through 18 population doublings for adult and neonatal cells.All cells test negative for mycoplasma, bacteria, yeast, and fungi. HIV-1, hepatitis B and hepatitis C are not detected for all donors and/or cell lots. A Certificate of Analysis is provided for each cell lot purchased. Content:1 x Cryopreserved ampule of Human Neonatal Epidermal Keratinocytes containing ≥ 500,000 cells