1. Keratinocytes are the most abundant cells in the epidermis, playing a vital role in maintaining skin structure and function.

角质细胞是表皮中最丰富的细胞类型，对维持皮肤的结构和功能起着至关重要的作用。

2. The differentiation of keratinocytes is regulated by various signaling pathways.

角质细胞的分化受到多种信号通路的调控。