干细胞可分为胚胎,胎儿或成年干细胞。 胚胎干细胞源自几天的胚胎。 胎儿干细胞源自流产的胎儿。 成体干细胞源于废弃的胎盘或出生后的任何阶段。 胚胎干细胞可产生几乎所有类型的细胞,而成年干细胞产生细胞的类型方面有限制。
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