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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、牛等动物也比灵长类动物更有希望，并且不会挑战伦理问题
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