<prompt> All the following statements regarding skin are true exceptSkin is stratified squamous epitheliumMelanocytes are immigrant cellsKeratin filaments are hallmark of epidermal cellsKeratinization causes hydration of cells  <response>: Keratinization provides protection, has no role in hydration of cells. The skin has three layers-- the epidermis, dermis and subcutaneous layer fat layer. Keratinization is a process of cytodifferentiation in which the keratinocytes are differentiated, hardened cell filled with keratin which serves as a scaffold for the cytoskeleton and play a major functional role in the integrity and mechanical stability of cells. Filaggrin helps in keratin assembly and then degrades to for amino acids and natural moisturizing factors which help in skin hydration. 