第 20 天,所有胚胎死亡,胚胎体外培养至此结束。
除了存活率提升之外,人细胞在人-猴胚胎中的占比也达到了 2%~7%,且在上胚层和下胚层中均有出现。上胚层与下胚层是囊胚(胚胎早期的一个阶段)的两个结构;随着胚胎发育,这两部分细胞将进一步发展为外胚层、中胚层、内胚层等,最终分化产生动物
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