Effect of marine algal polysaccharides (MAPs) on aflatoxin B1 (AFB1)-induced apoptosis 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) TUNEL assay findings with immunofluorescence staining of apoptosis in bursa of Fabricius of broilers, all images were magnified 200 × ; (B) apoptosis rate of bursa of Fabricius in broilers. 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).