A Chinese scientist, He Jiankui, announced last fall that he had created twin girls from an embryo whose DNA he edited in his lab using the powerful gene-editing tool CRISPR.
He said he modified a gene known as CCR5 to protect the girls from the AIDS virus. But there's also evidence the CCR5 variation has other effects, such as making people more vulnerable to the West Nile and influenza viruses. | 
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