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按照美国国立卫生研究院（NIH）的规定，有关人-灵长类动物嵌合体胚胎的实验无法得到他们的资金支持；2015 年，他们又宣布暂停资助人-非灵长类动物嵌合体胚胎的研究。
日本则相反，他们在 2019 年放开了管制。原本，含有人细胞的动物胚胎不能培养超过 14 天。但随着新规出台，在科学合理且必要的条件下，嵌合体胚胎不仅可以在 14 天后继续培育，而且允许被移植到代孕动
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