U.S. regulators warned a New York fertility doctor to stop marketing an experimental procedure that uses DNA from three people — a mother, a father and an egg donor — to avoid certain genetic diseases.
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The doctor, John Zhang, used the technique to help a Jordanian couple deliver a baby last year.
According to the Food and Drug Administration, Zhang said his companies wouldn't use its technology in the U.S. again without permission, yet they continue to promote it.
The procedure is not approved in the U.S., and Congress has barred the FDA from even reviewing proposals to conduct such experiments.
A receptionist at the fertility clinic said late Friday that no one was available to comment.