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Effect of dietary 5-hydroxytryptophan supplementation (0.2%, 5-HTP) and lipopolysaccharide (LPS, 1 mg/kg of body weight) on cytokine mRNA levels in the duodenum. (A) Interleukin (IL)-1; (B) IL-6; (C) IL-10; (D) transforming growth factor-β (TGF-β); (E) tumor necrosis factor-α (TNF-α); and (F) IgA. CD, control group; data are presented as the mean ± SD (n = 8); *P < 0.05.
