Human Dermal Fibroblasts are available from either adult skin (NHDF-Ad) or neonatal foreskin (NHDF-Neo). They are derived from the dermis of normal human neonatal foreskin or adult skin. They are cryopreserved at the end of primary culture.Lonza's human dermal fibroblasts are guaranteed through 15 population doublings when using FGM™-2 Growth Media. 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. Dermal fibroblasts are characterized by morphological observation throughout serial passage. A Certificate of Analysis is provided for each cell lot purchased.