| P51014 | HOA_PSES1 | Pseudomonas sp. (strain KKS102) | bphF | Detail |
| P10390 | NIFB_KLEPN | Klebsiella pneumoniae | nifB | Detail |
| D5VRM1 | NIFB_METIM | Methanocaldococcus infernus (strain DSM 11812 / JCM 15783 / ME) | nifB Metin_0554 | Detail |
| A6W1X1 | HOA_MARMS | Marinomonas sp. (strain MWYL1) | Mmwyl1_3801 | Detail |
| A1WLL2 | HOA_VEREI | Verminephrobacter eiseniae (strain EF01-2) | Veis_2781 | Detail |
| Q8KC85 | NIFB_CHLTE | Chlorobaculum tepidum (strain ATCC 49652 / DSM 12025 / NBRC 103806 / TLS) (Chlorobium tepidum) | nifB CT1540 | Detail |
| P09824 | NIFB_RHIME | Rhizobium meliloti (strain 1021) (Ensifer meliloti) (Sinorhizobium meliloti) | nifB RA0442 SMa0814 | Detail |
| Q1LNS4 | HOA1_CUPMC | Cupriavidus metallidurans (strain ATCC 43123 / DSM 2839 / NBRC 102507 / CH34) (Ralstonia metallidurans) | Rmet_1319 | Detail |
| C1DRJ0 | HOA2_AZOVD | Azotobacter vinelandii (strain DJ / ATCC BAA-1303) | mphE Avin_15130 | Detail |
| Q83VZ3 | HOA2_COMTE | Comamonas testosteroni (Pseudomonas testosteroni) | tesG | Detail |