Gene-Edited Cattle Have Major Screwup in DNA

Gene-Edited Cattle Have Major Screwup in DNA
Brandon Pollock /The Courier via AP

They were the poster animals for the gene-editing revolution, appearing in story after story. By adding just a few letters of DNA to the genomes of dairy cattle, a US startup company had devised a way to make sure the animals never grew troublesome horns.

To Recombinetics—the St. Paul, Minnesota gene-editing company that made the hornless cattle—the animals were messengers of a new era of better, faster, molecular farming.

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