第 19 天,仅有 3 枚嵌合体胚胎存活,这也是目前体外培养食蟹猴胚胎技术的极限。
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
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