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Researchers have produced human embryos containing DNA from three people, a biotechnological proof-of-principle with profound medical and ethical implications.

To accomplish this, chromosomes were taken from one zygote -- the single cell formed when sperm and egg fuse -- and put into a zygote stripped of its original chromosomes, but left with its original mitochondria, which provide each human cell with energy.

As they grew, the resulting embryos contained so-called nuclear DNA -- the 25,000 genes responsible for physical and developmental traits -- from two traditional parents, and mitochondrial DNA from a third.

3-Parent Embryos Could Prevent Disease, But Raise Ethical Issues | Wired Science | Wired.com

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