Mouse embryonic stem cells (ES cells) are derived from inner cell mass. It candifferentiate into variety cell types of three-germ laryer in vitro or in vivo and ispotentially used to therapy certain diseases in the future.

• 小鼠胚胎干细胞(mouse embryonic stem cells)是来源于早期胚胎内细胞团(inner cell mass)的细胞,它被移植到体内或是在体外培养条件下能分化成三个胚层中的各种类型的细胞。