“Adopt a Moratorium on Heritable Genome Editing.” Zhang of course signed up, as did Doudna’s erstwhile collaborator Charpentier. So did Berg, whose recombinant DNA discoveries had prompted Asilomar forty-four years earlier. “We call for a global moratorium on all clinical uses of human germline editing—that is, changing heritable DNA (in sperm, eggs or embryos) to make genetically modified children,” the article began.
