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Anti-M5BT IgA level in feces after oral immunization with MPs. Fecal samples were taken from mice at A 2 weeks, B 4 weeks and C relative anti-M5BT IgA level compared with untreated group. Antibody levels were analyzed by ELISA (n = 5, error bars represent standard deviations; *p < 0.05, one-way ANOVA)
