| aa | Amino acid |
| CK | Cytokinin |
| DI | Dimerization interface |
| ER | Endoplasmic reticulum |
| HK | Histidine kinase |
| HPt | Phosphotransmitter |
| MSP | Multistep phosphorelay |
| PHP | Pseudo-HPt |
| PRR | Pseudo response regulator |
| RD | Receiver domain |
| PM | Plasma membrane |
| REC-like | receiver-like (domain) |
| RR | Response regulator |
| RRA | A-Type response regulator |
| RRB | B-Type response regulator |
| SM | Sensor module |
| sol-HPt | Soluble phosphotransmitter |
| TM | Transmembrane domain (or protein) |
| TM-HPt | TM-containing phosphotransmitter |
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