| [A] Methanobrevibacter smithii (strain PS / ATCC 35061 / DSM 861) | METS301401 | A5UN39 | Tungsten formylmethanofuran dehydrogenase, subunit B, FwdB |
| [A] Methanobacterium thermoautotrophicum | METTH01522 | O27601 | Tungsten formylmethanofuran dehydrogenase, subunit B |
| [A] Methanocaldococcus jannaschii | METJA01224 | FWDB_METJA | Tungsten-containing formylmethanofuran dehydrogenase 2 subunit B |
| [A] Methanococcus aeolicus (strain Nankai-3 / ATCC BAA-1280) | META301445 | ABR57038.1 | Molybdopterin oxidoreductase |
| [A] Methanococcus maripaludis | METMP01691 | FWDB_METMP | Tungsten-containing formylmethanofuran dehydrogenase 2 subunit B |
| [A] Methanococcus maripaludis (strain C5 / ATCC BAA-1333) | METM501694 | ABO36012.1 | Tungsten containing formylmethanofuran dehydrogenase subunit B |
| [A] Methanococcus maripaludis (strain C6 / ATCC BAA-1332) | METM600968 | A9A8X2 | Molybdopterin oxidoreductase |
| [A] Methanococcus maripaludis (strain C7 / ATCC BAA-1331) | METM700959 | ABR66033.1 | Tungsten containing formylmethanofuran dehydrogenase subunit B |
| [A] Methanococcus vannielii (strain SB / ATCC 35089 / DSM 1224) | METVS00978 | ABR54896.1 | Molybdopterin oxidoreductase |
| [A] Methanoregula boonei (strain 6A8) | METB600871 | A7I6N4 | Molybdopterin oxidoreductase |
| [A] Methanocorpusculum labreanum (strain ATCC 43576 / DSM 4855 / Z) | METLZ00242 | A2SQ14 | Hypothetical protein |
| [A] Methanoculleus marisnigri (strain ATCC 35101 / DSM 1498 / JR1) | METMJ00605 | A3CT53 | Molybdopterin oxidoreductase |
| [A] Methanosphaerula palustris (strain ATCC BAA-1556 / DSM 19958 / E1-9c) | METPE02132 | B8GE27 | Formylmethanofuran dehydrogenase subunit B |
| [A] Methanospirillum hungatei (strain JF-1 / DSM 864) | METHJ01871 | Q2FRC6 | molybdopterin oxidoreductase |
| [A] Methanosarcina acetivorans | METAC00811 | Q8TSG2 | Formylmethanofuran dehydrogenase, subunit B |
| [A] Methanosarcina mazei | METMA01940 | Q8PVI3 | Tungsten formylmethanofuran dehydrogenase, subunit B |
| [A] Methanopyrus kandleri | METKA01526 | Q7LYU6 | Formylmethanofuran dehydrogenase subunit B, selenocysteine containing |
| [A] Uncultured methanogenic archaeon RC-I | UNCMA00265 | Q0W0U3 | tungsten formylmethanofuran dehydrogenase, subunit B |
| [B] Methylobacillus flagellatus (strain KT / ATTC 51484 / DSM 6875) | METFK01515 | Q1H0Q7 | formylmethanofuran dehydrogenase |
| [B] Nitrosococcus oceani (strain ATCC 19707 / NCIMB 11848) | NITOC00011 | Q3JF29 | formylmethanofuran dehydrogenase |
| [B] Methylococcus capsulatus | METCA02680 | Q603E7 | identified by similarity to GP:1881465 formylmethanofuran dehydrogenase |