| AHR | aryl hydrocarbon receptor |
| AHRE | AHR response element |
| AHRR | AHR repressor |
| ARNT | nuclear translocator of AHR |
| AMP | antimicrobial peptides |
| BUT | butyrate |
| CRC | colorectal cancer |
| DC | dendritic cell |
| DIM | 3,3-Diindolylmethane |
| DSS | dextran sulfate sodium |
| FICZ | 6-Formylindolo[3,2-b]carbazole |
| GF | germ-free |
| GPR109a | G-protein coupled receptor 109a |
| HDAC | Histone deacetylase |
| IA | indole-3-acrylic acid |
| IAA | indole-3-acetic acid |
| IAAl | indole-3-acetaldehyde |
| IAl | indole-3-aldehyde |
| IAL | indole-3-lactic acid |
| I3C | indole-3-carbinol |
| I3P | indole-3-pyruvate |
| IBD | inflammatory bowel disease |
| IC50 | half maximal inhibitory concentration |
| ICZ | indolo[3,2-b]carbazole |
| IEC | intestinal epithelial cells |
| IEL | intraepithelial lymphocytes |
| IL | interleukin |
| ILC3 | group 3 innate lymphoid cells |
| IPA | indole-3-propionic acid |
| KO | knock out |
| LI | large intestine |
| LP | lamina propria |
| MQ | macrophages |
| RORγt | RAR-related orphan receptor γt |
| SCFA | short chain fatty acid |
| SI | small intestine |
| STAT | signal transducers and activator of transcription |
| TCDD | 2,3,7,8-tetrachlorodibenzo-p-dioxin |
| TCR | T cell receptor |
| TGF-β | tumor growth factor beta |
| TNBS | trinitrobenzene sulfonic acid |
| Tra | tryptamine |
| Tr1 | type 1 regulatory T cells |
| Treg | regulatory T cells |
| Trp | tryptophan |
| UC | Ulcerative colitis |
| WT | wild type |