In line with this, χ 2 and Mann–Whitney U -tests provided highly significant support for increased incidence of site-specific positive selection and overall higher d N / d S values (M8A) in post-mating relative to pre-mating sperm proteins ( p < 0.01, each; electronic supplementary material, table S11).
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Mating systems and protein-protein interactions determine evolutionary rates of primate sperm proteins.
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