Specific carotenoid pigments in the diet and a bit of oxidative stress in the recipe for producing red carotenoid-based signals.

Finally, in the case of erythrocyte resistance to oxidative stress, the CAR × diquat interaction only showed a weak trend toward significance ( P = 0.090; Table 3 ), but the best-fitted model reported a significant diquat effect ( Table 4 ; Fig. 11 ).

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