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Immune Activation Reduces Sperm Quality in the Great Tit
Figure 2
Sperm swimming velocity 13 days post-hatch in relation to plumage breast coloration (PCA scores).
The line is the linear regression line. Excluding the outlier from the analysis did not qualitatively change the results.
doi: https://doi.org/10.1371/journal.pone.0022221.g002