In this case, at least, Huang had taken care to ensure that no CRISPR babies could be born as a result of his experiments by using triploid human embryos. So named because they contain three sets of twenty-three chromosomes (sixty-nine in total) instead of the normal two (forty-six in total), triploid embryos are nonviable, and in IVF procedures, it’s easy for doctors to identify triploid embryos
