| Strain | Pseudomonas fluorescens F113 |
| GI | 378949703 |
| Locus Tag | PSF113_1772 |
| Description | protein NirB |
| Strain | Pseudomonas denitrificans ATCC 13867 |
| GI | 472325303 |
| Locus Tag | H681_10685 |
| Description | assimilatory nitrite reductase small subunit |
| Strain | Hahella chejuensis KCTC 2396 |
| GI | 83648462 |
| Locus Tag | HCH_05822 |
| Description | ferredoxin subunit of nitrite reductase and ring-hydroxylating dioxygenases |