新华社伦敦4月3日消息 ，葡萄牙研究人员利用基因工程技术培育出了有6条腿的小鼠胚胎 。医学影像显示 ，这个小鼠胚胎在本该长外生殖器的部位 ，长出了两条额外的后肢 。这项研究揭示了DNA脱氧核糖核酸）三维结构的改 ...[查看全文]
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