ObjectiveEmbryonic stem cells (ESCs) are pluripotent cells derived from the inner cell mass (ICM) of pre-implantation mammal or human embryos and primordial germ cells (PGCs) of embryos.

• 胚胎干细胞(embryonic stem cells，ESCs)是由动物或人植入前胚胎的内细胞团(inner cell mass，ICM)或原始生殖细胞(primordial germ cells，PGCs)分离出来，经体外分化抑制培养筛选出的具有全能性的胚胎细胞。