“Researchers in the U.S. and U.K. have uncovered a link between an antimicrobial toxin that is produced by common gut bacteria to fend off their rivals and inflammatory bowel disease (IBD).”
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Iyer et al., “Dietary and Microbial Oxazoles Induce Intestinal Inflammation by Modulating Aryl Hydrocarbon Receptor Responses.” Cell 173, no. 5 (2018): 1123–1134.e11. https://doi.org/10.1016/j.cell.2018.04.037.