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As representatives of the Committee of Genome Editing of the Genetics Society of China and of the Chinese Society for Stem Cell Research, we were shocked by He Jiankui’s claims last month that twin girls were born from embryos that were gene-edited for HIV resistance (Nature563, 607–608; 2018). Such work would violate the current code of conduct from China’s ministry of health, as well as internationally accepted ethical guidelines (see go.nature.com/2erqwpc).