| TF | transcription factor |
| TFBS | transcription factor binding site |
| TCS | two-component system |
| SF | sigma factor |
| bEBP | bacterial enhancer binding proteins |
| HKS | histidine kinase sensor |
| DBD | DNA-binding domain |
| OG | orthologous group |
| TU | transcriptional unit |
| PWM | Position Weight Matrix |
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