| P56265 | NIFB_KLEOX | Klebsiella oxytoca | nifB | Detail |
| P46044 | NIFB_FRAAL | Frankia alni | nifB | Detail |
| B0TM56 | HUTU_SHEHH | Shewanella halifaxensis (strain HAW-EB4) | hutU Shal_0073 | Detail |
| A6VRA1 | MAND_MARMS | Marinomonas sp. (strain MWYL1) | Mmwyl1_0037 | Detail |
| P40802 | PKSI_BACSU | Bacillus subtilis (strain 168) | pksI BSU17170 | Detail |
| B1ELW6 | MAND_ESCAT | Escherichia albertii (strain TW07627) | rspA ESCAB7627_2604 | Detail |
| Q07W36 | HUTU_SHEFN | Shewanella frigidimarina (strain NCIMB 400) | hutU Sfri_3953 | Detail |
| P67417 | HUTU_STAAN | Staphylococcus aureus (strain N315) | hutU SA2122 | Detail |
| A7ZAE5 | HUTU_BACVZ | Bacillus velezensis (strain DSM 23117 / BGSC 10A6 / FZB42) (Bacillus amyloliquefaciens subsp. plantarum) | hutU RBAM_036420 | Detail |
| A5EQB6 | HUTU_BRASB | Bradyrhizobium sp. (strain BTAi1 / ATCC BAA-1182) | hutU BBta_6450 | Detail |