IFNG and irritable bowel syndrome: For measurements taken at 20 weeks’ gestation, between group effects observed include significant increases in IFN-γ (5.00 ± 2.24 pg/mL, P = 0.034) as well as significant decreases in both Trp (–556.52 ± 255.57 ng/mL, P = 0.031) and Kyn (–18.29 ± 8.27 ng/mL, P = 0.028) in the IBS cohort compared with the healthy cohort.