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Food and Drug Administration scientists who had a closer look at the genome sequence of one of the edited animals, a bull named Buri, have discovered its genome contains a stretch of bacterial DNA including a gene conferring antibiotic resistance. The “unintended” addition of DNA from a different species occurred during the gene-editing process itself, the government says. It went undetected by the company even as it touted the animals as 100% bovine and assailed the FDA for saying the animals needed to be regulated at all. “It was not something expected, and we didn’t look for it” says Tad…

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