So the statement that Doudna, Baltimore, and the other organizers crafted was very restrained. “At this summit we heard an unexpected and deeply disturbing claim that human embryos had been edited and implanted, resulting in a pregnancy and the birth of twins,” they wrote. “The procedure was irresponsible and failed to conform with international norms.” But there was no call for a ban or moratorium. Instead, the statement simply said that the safety risks were currently too great to permit germline editing “at this time.” It then proceeded to stress, “Germline genome editing could become
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