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Naturally aged mice exhibited significantly lower sperm concentration and motility compared to young mice , confirming age-related declines in sperm quality
DNA, cell turnover, and keratin production Hair growth requires rapid, continuous cell division at the follicle base
2012 Dec 7;53(13):8029-35
Researchers have had difficulty consistently measuring DSIP, confirming where it is produced, and determining exactly what role it plays in the body
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