胚胎幹細胞(Embryonic Stem Cells)起源於囊胚(Blastocyst)內部細胞(Inner Mass Cells),為多能幹細胞,它可以成為任何組織,但不包括胎盤。只有桑椹胚(Morula)的細胞是全能的,可以成為所有組織或胎盤。
Pluripotent, The stem cells can become any tissue in the body, excluding a placenta. Only the morula's cells are totipotent, able to become all tissues and a placenta.
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