LONDON (AP) — An influential British bioethics group says that couples who face the risk of having a baby with certain genetic diseases should be allowed to use eggs from two women to produce the embryo.

Such controversial procedures should only be allowed if they are proven safe, the Nuffield Council on Bioethics said Tuesday, but its advice seems likely to reignite debate. Currently, such treatments are only allowed for research in the U.K., and British law forbids altering a human egg or embryo before transferring it into a woman.