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Expression of catalase, CAT and superoxide dismutase 1, SOD1 genes in the jejunum of broiler chickens. Results are expressed as arbitrary units, AU, and are presented as mean and standard error. a,b Different letters represent significant differences between treatments by the Tukey test, P < 0.05. UC = unchallenged broilers; EC = Eimeria-challenged broilers. NS = non-supplemented diet; dl-Met = diet supplemented with free methionine; dl-MMet = diet supplemented with methionine dipeptide
