| GI | Gastrointestinal |
| AA | Amino acid |
| TRP | Tryptophan |
| IS | Indoxyl sulfate |
| IPA | IPA; Indole-3-propionic acid |
| IDO1 | IDO1; Indoleamine 2,3-dioxygenase |
| AhR | AhR; Aryl hydrocarbon receptor |
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