Embryonic stem ( es ) cells are pluripotent cells derived from the inner cell mass ( icm ) of early blastrocyts , which possess the ability of unlimitted proliferation and maintain normal dipoid keptypes under differentiation - inhibited culture in vitro , they will differentiate into multiple lineage cell types or occur commentent and differentiation without differentiation - inhibited factors or hi presence of certain induced - factors . 胚胎干细胞( es细胞) ，是存在于早期胚胎内细胞团( icm )的一种多潜能细胞。在体外抑制分化培养时， es细胞可无限增殖并保持正常的二倍体核型，一旦撤除分化抑制因素，或添加适当诱导剂， es细胞可发生谱系分化或定向分化。
