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March 18, 2010 4:20 pm
How a Man Produces 1500 Sperm a Second - National Geographic
Google News - testicular cancer
 National Geographic | How a Man Produces 1500 Sperm a Second National Geographic For instance, if germline stem cells stay stem cells for a long time and don't change into sperm cells, a man may be at risk of getting testicular cancer. ... |
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