| Strain | Pseudomonas syringae pv. tomato str. DC3000 | 
| GI | 28867847 | 
| Locus Tag | PSPTO_0619 | 
| Description | DNA-directed RNA polymerase subunit beta | 
| Strain | Pseudomonas putida W619 | 
| GI | 170723913 | 
| Locus Tag | PputW619_4756 | 
| Description | DNA-directed RNA polymerase subunit beta | 
| Strain | Azotobacter vinelandii CA6 | 
| GI | 482898807 | 
| Locus Tag | AvCA6_06170 | 
| Description | DNA-directed RNA polymerase subunit beta |