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Mean±SE levels of: A) superoxide dismutase (SOD); B) plasma antioxidant capacity, (AOX; FRAP assay corrected for uric acid), and C) plasma lipid peroxidation (MDA) at 15 days in great tit nestlings in urban (black) and rural (white) rearing habitats. Circles denote non-cross-fostered nestlings, and triangles denote cross-fostered nestlings. Numbers below bars indicate number of nestlings.
