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西班牙《国家报》周三报道，该国与美国科学家团队早前在中国成功培殖出一个人猴胚胎。但团体为了避免引起伦理争议，决定在胚胎2周大时终止计划，并销毁胚胎。

研究团队以59岁西班牙科学家贝尔蒙特为首，成员分别来自西班牙穆尔西亚天主教大学、美国加州索尔克生物研究所。为免引起法律问题，团队选择在中国试验，研究员把人类干细胞植入猴子的胚胎中，最终胚胎长出各类人体组织。但在长出中央神经系统前中止实验，研究人员把胚胎销毁。

曾于前年成功培殖人猪胚胎的贝尔蒙特称，成形后的干细胞可应用在人类器官移植。不过，巴塞隆拿再生医学中心主任拉亚质疑，倘胚胎大脑发展出人类神经元，有可能产生自我意识，引起伦理争议。参与研究的努涅斯也承认，当人类干细胞植入胚胎大脑，可能会产生自我毁灭的意识。