From BBC News:
Scientists believe they have made a potential breakthrough in the treatment of serious disease by creating a human embryo with three separate parents.
The embryos have been created using DNA from a man and two women in lab tests.
The technique is intended to help women with diseases of the mitochondria...
Faults in the mitochondrial DNA can cause around 50 known diseases, some of which lead to disability and death.
About one in every 6,500 people is affected by such conditions, which include fatal liver failure, stroke-like episodes, blindness, muscular dystrophy, diabetes and deafness.
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