Figure 3From: Tryptophan degradation in irritable bowel syndrome: evidence of indoleamine 2,3-dioxygenase activation in a male cohort A/B: (A) Plasma neopterin levels (nmol/L) in healthy controls and male IBS patients.(B)Correlation between neopterin levels and the kyn:tryp ratio (Pearson product-moment correlation, *p < 0.05, r = 0.7055).Back to article page