Last month, He Jiankui became the centre of a global firestorm when he publicly claimed that he had created the world’s first embryos genetically edited to be resistant to HIV, the virus that can lead to AIDS.

Speaking to a room packed with over 200 reporters and scientists at the Second International Summit on Human Genome Editing at the University of Hong Kong, He revealed that another pregnancy involving a genetically-modified embryo is under way.

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