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Potent mongol sperm

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A team of German scientists reported today that it has succeeded in turning stem cells that become sperm in mice into cells with many of the characteristics of embryonic stem ES cells. If the same feat can be done with human sperm stem cells, scientists say the technique could offer a much-sought alternative to destroying human embryos for acquiring ES-like cells. Spermatogonial stem cells, which continuously produce new sperm, are extremely hard to find in the testes. Only in did scientists finally succeed in growing such cells in culture from mice.

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