| P20620 | NIFD_METTL | Methanothermococcus thermolithotrophicus (Methanococcus thermolithotrophicus) | nifD | Detail |
| A0A067XML2 | PTAD_PESFW | Pestalotiopsis fici (strain W106-1 / CGMCC3.15140) | ptaD PFICI_10827 | Detail |
| Q59A28 | QORL1_BOVIN | Bos taurus (Bovine) | CRYZL1 | Detail |
| P17117 | NFSA_ECOLI | Escherichia coli (strain K12) | nfsA mda18 mdaA ybjB b0851 JW0835 | Detail |
| D7UQ39 | SOL6_ALTSO | Alternaria solani | sol6 | Detail |
| A0JJT9 | TENB_BEABA | Beauveria bassiana (White muscardine disease fungus) (Tritirachium shiotae) | tenB ORF2 | Detail |
| P77329 | HYFG_ECOLI | Escherichia coli (strain K12) | hyfG b2487 JW2472 | Detail |
| Q8KC92 | NIFH_CHLTE | Chlorobaculum tepidum (strain ATCC 49652 / DSM 12025 / NBRC 103806 / TLS) (Chlorobium tepidum) | nifH CT1533 | Detail |
| Q8R127 | SCPDL_MOUSE | Mus musculus (Mouse) | Sccpdh | Detail |
| P06661 | NIFH_ACIFR | Acidithiobacillus ferrooxidans (Thiobacillus ferrooxidans) | nifH | Detail |