卵裂球Blastomere、分裂球[1]、胚叶细胞)是受精卵发育过程所经历过的一个阶段,指的是由受精卵分裂而生成的形态上尚未分化的细胞。主要指的是从二细胞期到八细胞期之间的形态,其中每一个细胞都是胚胎干细胞,具有完全分化能力。卵裂球阶段之后会继续分裂进入桑葚胚[2]

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