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spermatozoon |
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spermatozoon
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Also, human sperm, which take about 10 weeks to develop, are acutely sensitive to temperature. Exposure to PCBs and p,p'-DDE and human sperm chromatin integrity. Gray explained that when human sperm and anegg unite, a whole, living, human being comes into existence, one that has the genetic material needed to inform and organize its growth. |
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