AHR and inflammatory bowel disease: - Animal: Colonization of mice with Lactobacillus alleviates DSS-induced IBDHuman cohort: In IBD patients, fecal SCFA levels decrease by 58.3% and indole levels decrease by 42.7% (P<0.001) Intervention: AhR agonists (indole analogs) improve intestinal barrier in human IBD patients