| 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 |
| C0RM77 | HUTU_BRUMB | Brucella melitensis biotype 2 (strain ATCC 23457) | hutU BMEA_B0916 | Detail |
| Q5WCP7 | HUTU_BACSK | Bacillus clausii (strain KSM-K16) | hutU ABC3330 | Detail |
| K0E2G4 | HTYD_ASPRU | Aspergillus rugulosus (Emericella rugulosa) | htyD | Detail |
| Q92RP0 | ILVD1_RHIME | Rhizobium meliloti (strain 1021) (Ensifer meliloti) (Sinorhizobium meliloti) | ilvD1 R00822 SMc00884 | Detail |
| Q6G6Y9 | HUTU_STAAS | Staphylococcus aureus (strain MSSA476) | hutU SAS2224 | Detail |
| B1VUR5 | HUTU_STRGG | Streptomyces griseus subsp. griseus (strain JCM 4626 / NBRC 13350) | hutU SGR_4462 | Detail |
| B8CGY4 | HUTU_SHEPW | Shewanella piezotolerans (strain WP3 / JCM 13877) | hutU swp_0133 | Detail |
| B6YU51 | DAPAL_THEON | Thermococcus onnurineus (strain NA1) | dapAL TON_0506 | Detail |