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(a) Mean+s.e. total concentration of carotenoids in the body of males and females (hashed bars) and the nuptial coloration of males (black bars) and (b) mean+s.e. susceptibility to oxidative stress (measured in terms of MDA, a by-product of lipid peroxidation) in males and females fed on either high- (high-C) or low- (low-C) carotenoid diets. **p<0.01, ***p<0.001.
