| P08625 | NIFH2_METTL | Methanothermococcus thermolithotrophicus (Methanococcus thermolithotrophicus) | nifH2 | Detail |
| Q97ME5 | NIFH_CLOAB | Clostridium acetobutylicum (strain ATCC 824 / DSM 792 / JCM 1419 / LMG 5710 / VKM B-1787) | nifH CA_C0253 | Detail |
| Q0C9L4 | CTVC_ASPTN | Aspergillus terreus (strain NIH 2624 / FGSC A1156) | ctvC ATEG_09620 | Detail |
| P9WNE9 | DESET_MYCTU | Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv) | Rv3230c | Detail |
| Q9UTA2 | FMP46_SCHPO | Schizosaccharomyces pombe (strain 972 / ATCC 24843) (Fission yeast) | fmp46 SPAC25B8.18 | Detail |
| Q4WR18 | HELB2_ASPFU | Neosartorya fumigata (strain ATCC MYA-4609 / Af293 / CBS 101355 / FGSC A1100) (Aspergillus fumigatus) | helB2 cyp5081B1 AFUA_4G14790 | Detail |
| B8NJG8 | LEPD_ASPFN | Aspergillus flavus (strain ATCC 200026 / FGSC A1120 / NRRL 3357 / JCM 12722 / SRRC 167) | lepD AFLA_066890 | Detail |
| C8V7P3 | IVOC_EMENI | Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139) (Aspergillus nidulans) | ivoC ANIA_10573 | Detail |
| P00466 | NIFD_KLEPN | Klebsiella pneumoniae | nifD | Detail |
| P22548 | NIFH4_CLOPA | Clostridium pasteurianum | nifH4 | Detail |