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Longtime combatants find themselves on the same side when it comes to manipulating the DNA of human embryos.

That may seem like an idea from a sci-fi flick, but it’s already here. The gene-editing technique is already used in research and has the potential to modify human DNA with unprecedented ease in the not-too-distant future. British regulators approved limited experiments in human embryos earlier this month.

The technology holds promise to cure diseases like cystic fibrosis or sickle cell and even revive extinct species. But critics fear it could also be harnessed to craft “designer babies,” who are more intelligent, beautiful or athletic and to “edit” embryonic cells to change an inherited trait forever.

Those dystopian prospects have aligned U.S. groups long at odds: The anti-abortion Susan B. Anthony List, Family Research Council and the Center for Bioethics and Culture oppose gene editing in embryos. So do abortion rights groups like Our Bodies Ourselves and the leadership of the Pro Choice Alliance for Responsible Research, albeit for very different reasons.

They’re not alone in raising concerns. Scientists...