在此之前的 20 年,我们总是在讨论,人与动物的嵌合体是否允许活下来;但我们很少论及,当嵌合体还只是一个早期胚胎(例如囊胚)时应该怎么处理。囊胚里含有人细胞,这问题比把人细胞移植到动物体内要复杂得多——如果只是定
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