'Of course it's not ethical': shock at gene-edited baby claims

Chinese geneticist He Jiankui's claim to have altered embryos prompts outcry from scientists

Scientists have expressed anger and doubt over a Chinese geneticist's claim to have edited the genes of twin girls before birth, as government agencies ordered investigations into the experiment.

A global outcry started after the genetic scientist He Jiankui claimed in a video posted on YouTube on Monday that he had used the gene-editing tool Crispr-Cas9 to modify a particular gene in two embryos before they were placed in their mother's womb.