Creative Bioarray's normal Human Epidermal Keratinocytes neonatal (HEKn), when grown in Creative Bioarray's LIDer K Medium, provides an ideal serum-free culture model, for the study of wound healing, toxicology or epithelial biology. Creative Bioarray's HEK are cryopreserved as primary cells to ensure the highest viability and plating efficiency. Our HEK are quality tested in LIDer K Medium to ensure optimal serum-free growth over a period of at least 15 population doublings at rates equal to or greater than serum-supplemented medium. Cell Features: HEKn are cryopreserved as primary cells. Cells are isolated from neonatal human foreskin and expanded once in culture vessels before cryopreservation. HEKa are cryopreserved as primary cells. Cells are isolated from adult human skin and expanded once in culture vessels before cryopreservation. HEK can be grown without serum, phenol red or antimicrobials when cultured in DermaLife medium. HEK are extensively tested for quality and optimal performance. Creative Bioarray guarantees performance and quality.