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(A) Mean proportion of motile sperm ± SE (■) and (B) proportion of oxidized over total glutathione (GSSG/GSH+GSSG) in sperm ± SE (□) of males with different social status. Ejaculates with higher motility have lower proportions of GSSG, while the greater the proportion of GSSG (e.g. the more oxidatively stressed the sperm cells) the less motile the ejaculate is. Proportions are logit-transformed.
