epigene

例句：

1. 1.The epidermis is the outer layer of skin cells.
   表皮是皮肤细胞的外层。
2. 2. Epigenetics studies how genes are expressed and modified by environmental factors.
   表观遗传学研究基因如何表达和由环境因素修改。
3. 3. In humans, the epigenome is influenced by both genetic and environmental factors.
   在人类中，表观基因组既受遗传因素也受环境因素的影响。