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Researchers at the University of Pittsburgh have grown five tiny human livers and successfully transplanted them into rats. The most significant aspect of the study is that the livers were grown from stem cells, not from the structures of rat cells. Human volunteers donated skin cells for the study, which was published in Cell Reports in June. The cells were reverse engineered into stem cells before being directed to become the cells needed to form a liver. Next, scientists seeded the cells into a rat liver that had all its rat cells removed.
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