AIM:Epidermis is in a process of constant regeneration because of the proliferation of keratinocyte stem cells (KSCs) located within the basal compartment of epidermis.

• 表皮终身处于更新之中,这是由于表皮基底层中角朊干细胞的增殖分化与外层终末分化细胞不断脱落之间的动态平衡所致。