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Effect of dietary 5-hydroxytryptophan supplementation (0.2%, 5-HTP) and lipopolysaccharide (LPS, 1 mg/kg of body weight) on secretory immunoglobulin A (sIgA) concentrations in serum and intestinal contents. (A) serum sIgA; (B) sIgA in duodenum contents; (C) sIgA in jejunum contents; and (D) sIgA in ileum contents. Data are presented as the mean ± SD (n = 8); *P < 0.05.
