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Fig. 3. (A) Humoral immunity (plasma heterologous antibody concentration measured as the number of plate wells with hemagglutination; means + S.D.) in control (white columns; N=10) and testosterone-(T) treated (black columns; N=10) adult male house finches five (D39) and 21 (D55) days after the fourth injection of antigen (washed sheep red blood cells). Samples were collected 39 (D39) and 55 (D55) days after initiation of the T or control treatment. *Indicates a significant (P<0.05) difference between two groups (Student–Newman–Keuls test). (B) Cell-mediated immunity (difference in wing web thickness from day 63; medians ±0.5 interquartile intervals) measured one (D64), two (D65) and three (D66) days after one local injection of phytohemaglutinin to testosterone-treated (filled circles) and control (open circles) males. *Indicates a statistically significant difference between C and T males. #Indicates a difference between time points within a same group. See legend of A for additional comments.





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