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。
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