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Newly characterized stem cell self-renewal factor enables continuous sperm production

Unlike women, who are born with all the eggs they'll ever have, men can continue to produce sperm throughout their adult lives. To do so, they require a constant renewal of spermatogonial stem cells, which give rise to sperm.

Mice cloned from frozen dead cells, able to produce offspring

Japanese researchers have created a new method of storing somatic cells to clone mice with, resulting in a 0.2-5.4% success rate.

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