U.S. "Will Not Fund Research For Modifying Embryo DNA"

Modifying the DNA of embryos is a "line that should not be crossed", a leading figure in US research says.

Dr Francis Collins, National Institutes of Health director, was responding to reports that the first embryos had been modified in China.

He argued there were "serious and unquantifiable safety issues", big ethical questions and no compelling medical reason to do it.

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