In addition, there was evidence that some unwanted off-target edits had been made and also that both embryos had been mosaics, meaning there had been enough cell division before the CRISPR editing was done that some of the resulting cells in the babies were unedited. Despite all of this, Jiankui later said, the parents chose to have both embryos implanted. Kiran Musunuru of the University of Pennsylvania later commented, “The first attempt to hack the code of life and, ostensibly, improve the health of human babies had in fact been a hack job.”
