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Pigs’ Bladder Helps Patients' Stem Cells Grow Missing Muscles

The promise that stem cells may someday help regenerate damaged tissue seems to be close to fulfillment. Scientists at the University of Pittsburgh School of Medicine report that some of their severely injured patients grew new muscle tissue with the help of pigs’ bladders. After a skiing accident in which he lost much of the muscle in his left calf, Nicholas Clark could no longer do many of his regular activities. “In addition to the muscle loss, I had a lot of nerve loss and blood...

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