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The effects of tryptophan supplementation on the mRNA expression of tight junction protein. ZO-1, zonula occludens-1; CON, control group; LPS-CON, piglets challenged with lipopolysaccharide; LPS-Trp, piglets fed with tryptophan and challenged with lipopolysaccharide. Values are shown as mean ± standard error (n = 6). *P < 0.05; **P < 0.01.
