| Strain | Pseudomonas aeruginosa PAO1 |
| GI | 15596370 |
| Locus Tag | PA1173 |
| Description | cytochrome c-type protein NapB precursor |
| Strain | Pseudomonas mendocina NK-01 |
| GI | 330504173 |
| Locus Tag | MDS_3259 |
| Description | periplasmic nitrate reductase subunit NapB |
| Strain | Hahella chejuensis KCTC 2396 |
| GI | 83646108 |
| Locus Tag | HCH_03366 |
| Description | nitrate reductase cytochrome c-type subunit |