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【单选题】
下列关于干细胞的叙述,正确的是( )A.
干细胞的复制通常表现为对称复制
B.
胚胎干细胞是指胚胎发育早期的囊胚中已分化的细胞
C.
胚胎干细胞可形成人体的部分组织和器官
D.
干细胞广泛存在于人体组织器官中
E.
干细胞不具有转分化能力
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