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Human-animal hybrids to be developed in Japan after ban controversially lifted

Human-animal hybrids are to be developed in embryo form in Japan after the government approved controversial stem-cell research. Human cells will be grown in rat and mouse embryos, then brought to term in a surrogate animal, as part of experiments set to be carried out at the University of Tokyo. Supporters say the work ? led by renowned geneticist Hiromitsu Nakauchi ? could be a vital first step towards eventually growing organs that can then be transplanted into people in need.