Rezaei Z, Sadri F. The Tryptophan–AhR Circuit in the Gut: Microbial Indoles, Kynurenines, Serotonin, and Therapeutic Opportunities in Inflammatory Bowel Disease__A Comprehensive Review. J DIGEST BIOMOL THER. 2025;1(1):9-24. Accessed February 24, 2026. https://jdbt.eternopublisher.com/index.php/jdbt/article/view/7