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Ratios of tryptophan (TRP) and its metabolite levels (mg/gCr): kynurenine (KYN), kynurenic acid (KYNA), quinolinic acid (QA) in patients with small intestinal bacterial overgrowth before (grey) and after (black) rifaximin treatment. Differences were examined by Wilcoxon signed rank test; n = 40; * p < 0.05, ** p < 0.01.
