| T2R | Taste receptor type 2 (bitter taste receptor) protein |
| Tas2r/TAS2R | Taste receptor type 2 (bitter taste receptor) gene |
| T1R | Taste receptor type 1 (sweet/umami taste receptor) protein |
| Tas1r/TAS1R | Taste receptor type 1 (sweet/umami taste receptor) gene |
| OR | Olfactory receptor (protein in upright or gene in italic) |
| TAAR | Trace amine-associated receptor (protein in upright or gene in italic) |
| V1R | Vomeronasal receptor type 1 (protein in upright or gene in italic) |
| V2R | Vomeronasal receptor type 2 (protein in upright or gene in italic) |
| GPCR | G protein-coupled receptor |
| TM | Transmembrane |
| QSM | Quorum-sensing molecule |
| EEC | Enteroendocrine cell |
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