Researchers in Japan who cultivated menstrual blood samples for one month observed that 20% of the stem-cell-like cells started beating about three days after being placed in vitro with heart cells from rats, eventually forming sheetlike heart-muscle tissue. The use of menstrual blood yielded a success rate 100 times higher than the 0.2%-0.3% for stem cells derived from human bone marrow, one scientist said.

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