'Three parent babies' take a step closer to reality, after an egg with two biological mothers successfully fertilized. Eggs from young donors to repair damaged eggs of older women in order to increase their chances of fertilization. IVF often fails in older women because there are abnormalities in the outside of their eggs, known as cytoplasm, which surrounds the nucleus one way around the problem would be too implant the healthy nucleus - which contains most of the information to produce a baby - into the cytoplasm of a donor, usually a younger mother.In 2001, a furore erupted in the US when mitochondria from young eggs was injected into older women's eggs to improve their quality. Fifteen babies were born at the time using the technique, it was claimed

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