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Human cloning has been used to produce early embryos, marking a “significant step” for medicine, say US scientists. The cloned embryos were used as a source of stem cells, which can make new heart muscle, bone, brain tissue or any other type of cell in the body. The technique used – somatic cell nuclear transfer – has been well-known since Dolly the sheep became the first mammal to be cloned, in 1996. The study, published in the journal Cell, used methods like those that produced Dolly the sheep in the UK.
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