| WP_011187724.1 | Desulfotalea psychrophila | [FeFe] Group A4 | Deltaproteobacteria | Desulfobacterales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_011366599.1 | Desulfovibrio alaskensis | [FeFe] Group A4 | Deltaproteobacteria | Desulfovibrionales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_011388063.1 | Rhodospirillum rubrum | [FeFe] Group A4 | Alphaproteobacteria | Rhodospirillales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_011393383.1 | Moorella thermoacetica | [FeFe] Group A4 | Firmicutes | Thermoanaerobacterales | Bifurcating | Labile | 6 | [FeFe]-centre, 2 x [4Fe4S] clusters | NADP dehydrogenase, four FeS proteins |
| WP_011989407.1 | Clostridium kluyveri | [FeFe] Group A4 | Firmicutes | Clostridiales | Bifurcating | Labile | 6 | [FeFe]-centre, 2 x [4Fe4S] clusters | NADP dehydrogenase, four FeS proteins |
| WP_012031839.1 | Pelotomaculum thermopropionicum | [FeFe] Group A4 | Firmicutes | Clostridiales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_012662530.1 | Desulfobacterium autotrophicum | [FeFe] Group A4 | Deltaproteobacteria | Desulfobacterales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_012765956.1 | Desulfovibrio salexigens | [FeFe] Group A4 | Deltaproteobacteria | Desulfovibrionales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_013237377.1 | Clostridium ljungdahlii | [FeFe] Group A4 | Firmicutes | Clostridiales | Bifurcating | Labile | 6 | [FeFe]-centre, 2 x [4Fe4S] clusters | NADP dehydrogenase, four FeS proteins |
| WP_013238388.1 | Clostridium ljungdahlii | [FeFe] Group A4 | Firmicutes | Clostridiales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_013275594.1 | Thermosediminibacter oceani | [FeFe] Group A4 | Firmicutes | Thermoanaerobacterales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_014282026.1 | Paenibacillus terrae | [FeFe] Group A4 | Firmicutes | Bacillales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_014355220.1 | Acetobacterium woodii | [FeFe] Group A4 | Firmicutes | Clostridiales | Bifurcating | Labile | 6 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | NADP dehydrogenase, four FeS proteins |
| WP_015337360.1 | Desulfovibrio hydrothermalis | [FeFe] Group A4 | Deltaproteobacteria | Desulfovibrionales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_015707165.1 | Treponema primitia | [FeFe] Group A4 | Spirochaetes | Spirochaetales | Bifurcating | Labile | 6 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | NADP dehydrogenase, four FeS proteins |
| WP_016822145.1 | Paenibacillus polymyxa | [FeFe] Group A4 | Firmicutes | Bacillales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_018591881.1 | Terrisporobacter glycolicus | [FeFe] Group A4 | Firmicutes | Clostridiales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_018884458.1 | Paenibacillus massiliensis | [FeFe] Group A4 | Firmicutes | Bacillales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_021432325.1 | Peptoclostridium bifermentans | [FeFe] Group A4 | Firmicutes | Clostridiales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_023162857.1 | Clostridium autoethanogenum | [FeFe] Group A4 | Firmicutes | Clostridiales | Bifurcating | Labile | 6 | [FeFe]-centre, 2 x [4Fe4S] clusters | NADP dehydrogenase, four FeS proteins |
| WP_023975234.1 | Clostridium pasteurianum | [FeFe] Group A4 | Firmicutes | Clostridiales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_024825939.1 | Desulfovibrio magneticus | [FeFe] Group A4 | Deltaproteobacteria | Desulfovibrionales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_025688954.1 | Paenibacillus zanthoxyli | [FeFe] Group A4 | Firmicutes | Bacillales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_025700928.1 | Paenibacillus forsythiae | [FeFe] Group A4 | Firmicutes | Bacillales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_026885750.1 | Clostridium beijerinckii | [FeFe] Group A4 | Firmicutes | Clostridiales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_027186285.1 | Desulfovibrio inopinatus | [FeFe] Group A4 | Deltaproteobacteria | Desulfovibrionales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_027721164.1 | Desulfovibrio zosterae | [FeFe] Group A4 | Deltaproteobacteria | Desulfovibrionales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| WP_028591227.1 | Paenibacillus panacisoli | [FeFe] Group A4 | Firmicutes | Bacillales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| AIO18483.1 | Mollicutes bacterium HR1 | [FeFe] Group B | Tenericutes | Mollicutes | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_002568888.1 | Lachnoclostridium bolteae | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_002570587.1 | Lachnoclostridium bolteae | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_002580023.1 | Clostridium butyricum | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_002582769.1 | Clostridium butyricum | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_002704855.1 | Treponema saccharophilum | [FeFe] Group B | Spirochaetes | Spirochaetales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_002843191.1 | Peptostreptococcus anaerobius | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_002845087.1 | Peptostreptococcus anaerobius | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_002848990.1 | Ruminococcus albus | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_003148188.1 | Atopobium rimae | [FeFe] Group B | Actinobacteria | Coriobacteriales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_003492333.1 | Clostridium sporogenes | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_003495774.1 | Clostridium sporogenes | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_003530568.1 | Ruminiclostridium leptum | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_003532170.1 | Ruminiclostridium leptum | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_003540297.1 | Desulfotomaculum nigrificans | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_004052440.1 | Eubacterium plexicaudatum | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_004054251.1 | Eubacterium plexicaudatum | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_004093662.1 | Acetonema longum | [FeFe] Group B | Firmicutes | Selenomonadales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_004099977.1 | Acetonema longum | [FeFe] Group B | Firmicutes | Selenomonadales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_004307174.1 | Bacteroides ovatus | [FeFe] Group B | Bacteroidetes | Bacteroidales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_004330064.1 | Alistipes putredinis | [FeFe] Group B | Bacteroidetes | Bacteroidales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_004602330.1 | Eubacterium cellulosolvens | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |