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
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