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Fig. 2. Plasma testosterone (T) concentrations (median ±0.5 interquartile
intervals), widths of the cloacal protuberance (CP; id.) and body masses (mean
± S.D.) of adult male house finches as a function of time
after the beginning of T administration on Day 0. *Indicates a
significant difference (StudentNewmanKeuls test,
P<0.05) between T-treated (filled circles; N=10) and
control (open circles; N=10) males.