| Abbreviation | Annotation |
| CCT | CO, COL and TOC1 |
| CHASE | cyclases/histidine kinases associated sensing extracellular |
| CK | cytokinin |
| CKI | cytokinin independent |
| CRE | cytokinin response |
| ETR | ethylene response |
| GAF | cGMP phosphodiesterase/adenylyl cyclase/FhlA |
| HATPase | histidine kinase-like ATPase |
| HisKA | His Kinase A (phosphoacceptor) domain |
| HK | histidine kinase |
| HKL | histidine-kinase like |
| HP | histidine phosphotransfer |
| HPt | histidine-containing phosphotransfer |
| PAS | Per-ARNT-Sim |
| PDK | pyruvate dehydrogenase kinase |
| PHY | phytochrome |
| PM | plasma membrane |
| Rec | receiver |
| RR | response regulator |
| TCS | two-component system |
| TM | transmembrane |