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物体内,但不能与人的生殖细胞进行任何结合。
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