| Q44045 | NIFD_ALCFA | Alcaligenes faecalis | nifD | Detail |
| P33177 | NIFD_ANASL | Anabaena sp. (strain L31) | nifD | Detail |
| P15052 | NIFK_ACIFR | Acidithiobacillus ferrooxidans (Thiobacillus ferrooxidans) | nifK | Detail |
| P51754 | NIFK_METBA | Methanosarcina barkeri | nifK2 | Detail |
| Q6UEF0 | NADA_ASPPU | Aspergillus parasiticus (strain ATCC 56775 / NRRL 5862 / SRRC 143 / SU-1) | nadA P875_00053008 | Detail |
| P00457 | NIFH1_NOSS1 | Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576) | nifH1 nifH all1455 | Detail |
| A0A2Z5TMB8 | HIMC_ASPJA | Aspergillus japonicus | himC | Detail |
| J4VWM7 | OPS4_BEAB2 | Beauveria bassiana (strain ARSEF 2860) (White muscardine disease fungus) (Tritirachium shiotae) | OpS4 BBA_08182 | Detail |
| P00462 | NIFH_RHIET | Rhizobium etli | nifH | Detail |
| A0A0E3D8M1 | PC21_PENCR | Penicillium crustosum (Blue mold fungus) | PC-21 | Detail |