Researcher reveals more details on human embryo gene editing

A Chinese scientist at the center of an ethical storm over what he claims are the world's first genetically edited babies said on Wednesday he is proud of his work and revealed that there has been another chemical pregnancy as part of the research.

Biological researcher He Jiankui also revealed more details of the controversial experiment in which he edited genes in human embryos that led to the birth of twin girls, Lulu and Nana.