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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。
关于人细胞引入动物胚胎的实验，各国有自己的规定 | B
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