| Q3T044 | P33MX_BOVIN | Bos taurus (Bovine) | P33MONOX | Detail |
| Q5U2R6 | P33MX_RAT | Rattus norvegicus (Rat) | P33monox Aa2-141 | Detail |
| P25313 | NIFD_AZOBR | Azospirillum brasilense | nifD | Detail |
| P07328 | NIFD_AZOVI | Azotobacter vinelandii | nifD | Detail |
| P00467 | NIFD_CLOPA | Clostridium pasteurianum | nifD | Detail |
| P33164 | PDR_BURCE | Burkholderia cepacia (Pseudomonas cepacia) | ophA1 | Detail |
| P0CW52 | NIFK_METMI | Methanococcus maripaludis (Methanococcus deltae) | nifK | Detail |
| O27606 | NIFK_METTH | Methanothermobacter thermautotrophicus (strain ATCC 29096 / DSM 1053 / JCM 10044 / NBRC 100330 / Delta H) (Methanobacterium thermoautotrophicum) | nifK MTH_1564 | Detail |
| Q56RZ6 | LTMM_EPIFI | Epichloe festucae var. lolii (Neotyphodium lolii) (Acremonium lolii) | ltmM | Detail |
| C8VQ61 | MDPL_EMENI | Emericella nidulans (strain FGSC A4 / ATCC 38163 / CBS 112.46 / NRRL 194 / M139) (Aspergillus nidulans) | mdpL tynL ANIA_10023 | Detail |