After a period of growth, to 4 pm at the blastoderm over the weekend inside and outside the two germ layers, from the ectodermal layer of differentiated cells within the mesoderm to form embryos.
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释义
经过一段时间的发育,到4周末时在胚盘内、外两胚层之间,由外胚层分化出一层细胞,形成胚内中胚层。
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