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“Trp feeding exhibited protective effects (Fig. 1 B and D–G). A major feature of DSS colitis that leads to this morbidity and inflammation is an increase in permeability of the gut epithelium.”
“Trp” = tryptophan
https://www.pnas.org/doi/10.1073/pnas.2000047117
833772 Comments-
Also to be noted they induced colitis with sulphate antibiotics which directly deplete tryptophan-metabolizing [good] bacteria!
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