Figure 2From: Tryptophan degradation in irritable bowel syndrome: evidence of indoleamine 2,3-dioxygenase activation in a male cohort A/B: (A) Plasma kynurenic acid levels (μmol/L) in healthy controls and male IBS patients and (B) Kynurenic acid:kynurenine ratio in healthy controls and male IBS patients.Back to article page