不过,也有科学家对这项研究提出质疑。剑桥大学的发育生物学家阿方索·马丁内斯·阿里亚斯(Alfonso Martinez Arias)认为,这项研究的数据不够有说服力,胚胎的存活率在 15 天后迅速下降,说明这些嵌合体胚胎的状况并不好。另外,如果想要培育可用于移植的器官,可以通过体外类器官培养,这可以避免实验动物的伦理问题;而就算要用嵌合体动物,猪、牛等
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