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Scattergram illustrating the significant interaction term between sex and basal superoxide (bSO) levels for the immune response towards PHA (standardized for body size; residuals from a foot pad swelling—SVL regression). Males, filled circles and solid line (n = 20; b: −0.043 ± 0.014; F1,18 = 9.10, p = 0.007); females, open circles and dashed line (n = 25; b: 0.014 ± 0.012; F1,23 = 1.37, p = 0.25).
