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Effect of Bifidobacterium strains on immunoglobulin A (IgA) production by Peyer’s patch cells. Lipopolysaccharide was used as the positive control for induction of IgA secretion. The IgA concentration in the culture media was determined by ELISA. Each value is expressed as the means ± SEM of three independent experiments. *p < 0.05 and **p < 0.01 in comparison with the untreated control. #p < 0.05 compared with BB12 treated.
