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He Jiankui, a Shenzhen-based scientist trained in the United States, announced Monday that he would have used Crispr, a powerful gene-editing tool, to make newly-born twin girls resistant to HIV. His statement, which has not been backed by peer-reviewed data and has not been verified, has sparked widespread condemnation from scientists in China and elsewhere, with some saying it is irresponsible to use it. technology with long-term effects still poorly understood. 19659002]
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