| Strain | Pseudomonas syringae pv. tomato str. DC3000 |
| GI | 28871164 |
| Locus Tag | PSPTO_4021 |
| Description | S4 domain-containing protein |
| Strain | Pseudomonas putida DOT-T1E |
| GI | 397696762 |
| Locus Tag | T1E_4021 |
| Description | RNA-binding S4 domain-containing protein |
| Strain | Azotobacter vinelandii CA6 |
| GI | 482900134 |
| Locus Tag | AvCA6_16880 |
| Description | 16S rRNA uridine-516 pseudouridylate synthase |