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In Breakthrough, Scientists Edit a Dangerous Mutation From Genes in Human Embryos

Researchers have found a way to reliably remove disease-causing mutations from human embryos, an achievement sure to renew concerns over so-called designer babies.

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A New Form of Stem-Cell Engineering Raises Ethical Questions

“Sheefs” will test the limits of current regulations, experts say, as embryolike structures are created directly from stem cells.