👉 In mathematics, a keratinocyte (or keratinoid cell) is a type of epithelial cell that is responsible for the production and regulation of keratin proteins. Keratinocytes are specialized cells in the skin that produce and regulate keratins, which are crucial components of the skin's barrier function. The keratin proteins found in keratinocytes include keratin 1 (K1), keratin 2 (K2), keratin 3 (K3), and keratin