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trophoblast
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滋养层细胞
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trophoblast
滋养层细胞
哺乳动物胚胎从受精卵发育到囊胚期,经历了一系列的细胞分裂和形态改变,发生了第一次细胞谱系分化,在囊胚期,定位在胚胎表层的细胞分化形成的细胞。
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trophoblast
滋养层
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