Effect of dietary aflatoxin B1 (AFB1) and marine algal polysaccharides (MAPs) on relative mRNA expression of antioxidant-related genes of the bursa of Fabricius in broilers. CON, control group, basal diet without addition of MAPs and AFB1; AFB1, basal diet with addition of 100 μg/kg AFB1; AFB1 + MAPs, basal diet with addition of 100 μg/kg and 2,500 mg/kg MAPs. (A) Relative mRNA expression of superoxide dismutase 1 (SOD1); (B) relative mRNA expression of superoxide dismutase 2 (SOD2); (C) relative mRNA expression of glutathione peroxidase 1 (GPx1); (D) relative mRNA expression of glutathione peroxidase 3 (GPx3); (E) relative mRNA expression of catalase 1 (CAT1); (F) relative mRNA expression of glutathione S-transferase theta 1 (GSTT1); (G) relative mRNA expression of glutathione S-transferase omega 1 (GSTO1); (H) relative mRNA expression of glutathione S-transferase alpha 3 (GSTA3); (I) relative mRNA expression of NF-E2-related factor 2 (Nrf2); (J) relative mRNA expression of heme oxygenase-1 (HO-1); (K) relative mRNA expression of p38 mitogen-activated protein (p38MAPK). All data were expressed as means ± SE (n = 6). ∗Means with an asterisk indicates a significant difference from control by Tukey's test (∗P < 0.05; ∗∗P < 0.01).