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He Jiankui presented a slide at a Hong Kong, China, genome-editing summit that showed DNA sequences from the edited CCR5 genes in the twin girls.   NATIONAL ACADEMIES/FLICKR (CC BY-NC-SA 2.0)

Did CRISPR help—or harm—the first-ever gene-edited babies?

This story, one in a series, was supported by the Pulitzer Center. Since the gene-edited babies known as Lulu and Nana became international news in…

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