A CRISPR Calf Reveals Technique's Unpredictability

The calf was late. His due date, March 30, had come and gone. At first, Alison Van Eenennaam chalked it up to male calves tending to arrive a day or two on the tardy side. As the week wore on, the animal geneticist reminded herself that gene-edited embryos—like the one that had been growing inside Cow 3113 for the past nine months—can take a little longer to signal to their surrogate mothers that they're ready to be born.

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