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
%A1%BE%C4%A7%CA%F5%B9%A4%BE%DF%A1%BF%B5%C2%D6%DD%84%93%D0%C2%D7%F7%B1%D7%DA%41%E5%58%C8%AB%D7%D4%84%D3%BB%AF%D4%4F%82%E4%40%31%33%37%31%30%30%37%39%36%38%38
%A1%BE%C4%A7%CA%F5%B9%A4%BE%DF%A1%BF%B5%C2%D6%DD%84%93%D0%C2%D7%F7%B1%D7%DA%41%E5%58%C8%AB%D7%D4%84%D3%BB%AF%D4%4F%82%E4%40%31%33%37%31%30%30%37%39%36%38%38
%A1%BE%C4%A7%CA%F5%B9%A4%BE%DF%A1%BF%B5%C2%D6%DD%84%93%D0%C2%D7%F7%B1%D7%DA%41%E5%58%C8%AB%D7%D4%84%D3%BB%AF%D4%4F%82%E4%40%31%33%37%31%30%30%37%39%36%38%38
%A1%BE%C4%A7%CA%F5%B9%A4%BE%DF%A1%BF%B5%C2%D6%DD%84%93%D0%C2%D7%F7%B1%D7%DA%41%E5%58%C8%AB%D7%D4%84%D3%BB%AF%D4%4F%82%E4%40%31%33%37%31%30%30%37%39%36%38%38
%A1%BE%C4%A7%CA%F5%B9%A4%BE%DF%A1%BF%B5%C2%D6%DD%84%93%D0%C2%D7%F7%B1%D7%DA%41%E5%58%C8%AB%D7%D4%84%D3%BB%AF%D4%4F%82%E4%40%31%33%37%31%30%30%37%39%36%38%38
%A1%BE%C4%A7%CA%F5%B9%A4%BE%DF%A1%BF%B5%C2%D6%DD%84%93%D0%C2%D7%F7%B1%D7%DA%41%E5%58%C8%AB%D7%D4%84%D3%BB%AF%D4%4F%82%E4%40%31%33%37%31%30%30%37%39%36%38%38
%A1%BE%C4%A7%CA%F5%B9%A4%BE%DF%A1%BF%B5%C2%D6%DD%84%93%D0%C2%D7%F7%B1%D7%DA%41%E5%58%C8%AB%D7%D4%84%D3%BB%AF%D4%4F%82%E4%40%31%33%37%31%30%30%37%39%36%38%38
