Creative Bioarray's normal Human Epidermal Keratinocytes (HEK), when grown in Creative Bioarray's LIDer K Medium, provide an ideal serum-free culture model, for the study of wound healing, toxicology or epithelial biology. When in need of multiple keratinocyte cell lots, our HEK, 10-donor pool offers a wide range of donor demographics for research at an economical price. All 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. Our HEK need not be exposed to antimicrobials or phenol red when cultured in LIDer medium; an advantage since these supplements can cause cell stress and masking effects that may negatively impact experimental result. 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.