| XP_008860420.1 | Entamoeba nuttalli | [FeFe] Group A1 | Amoebozoa | Amoebida | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| XP_008860272.1 | Entamoeba nuttalli | [FeFe] Group A1 | Amoebozoa | Amoebida | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| XP_008856018.1 | Entamoeba nuttalli | [FeFe] Group B | Amoebozoa | Amoebida | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| XP_005854537.1 | Nannochloropsis gaditana | [FeFe] Group A1 | Heterokonta | Eustigmatales | Evolving | Labile | 1 | [FeFe]-centre | None |
| XP_005848612.1 | Chlorella variabilis | [FeFe] Group A1 | Chlorophyta | Chlorellales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| XP_005847147.1 | Chlorella variabilis | [FeFe] Group A1 | Chlorophyta | Chlorellales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| XP_005843810.1 | Chlorella variabilis | [FeFe] Group A1 | Chlorophyta | Chlorellales | Evolving | Labile | 1 | [FeFe]-centre | None |
| XP_002956049.1 | Volvox carteri | [FeFe] Group A1 | Chlorophyta | Volvocales | Evolving | Labile | 1 | [FeFe]-centre | None |
| XP_002948483.1 | Volvox carteri | [FeFe] Group A1 | Chlorophyta | Volvocales | Evolving | Labile | 1 | [FeFe]-centre | None |
| XP_002674266.1 | Naegleria gruberi | [FeFe] Group A1 | Percolozoa | Schizopyrenida | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| XP_002295160.1 | Thalassiosira pseudonana | [FeFe] Group A1 | Heterokonta | Thalassiosirales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| XP_001709915.1 | Giardia lamblia | [FeFe] Group A1 | Metamonada | Diplomonadida | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| XP_001694503.1 | Chlamydomonas reinhardtii | [FeFe] Group A1 | Chlorophyta | Chlamydomonadales | Evolving | Labile | 1 | [FeFe]-centre | None |
| XP_001693376.1 | Chlamydomonas reinhardtii | [FeFe] Group A1 | Chlorophyta | Chlamydomonadales | Evolving | Labile | 1 | [FeFe]-centre | None |
| XP_001584012.1 | Trichomonas vaginalis | [FeFe] Group A1 | Metamonada | Trichomonadida | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| XP_001580488.1 | Trichomonas vaginalis | [FeFe] Group A1 | Metamonada | Trichomonadida | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | Fusion with sulfite reductase |
| XP_001580286.1 | Trichomonas vaginalis | [FeFe] Group A1 | Metamonada | Trichomonadida | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| XP_001330775.1 | Trichomonas vaginalis | [FeFe] Group A1 | Metamonada | Trichomonadida | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| XP_001328981.1 | Trichomonas vaginalis | [FeFe] Group A1 | Metamonada | Trichomonadida | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| XP_001324510.1 | Trichomonas vaginalis | [FeFe] Group A1 | Metamonada | Trichomonadida | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| XP_001322682.1 | Trichomonas vaginalis | [FeFe] Group A1 | Metamonada | Trichomonadida | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | Fusion with ferredoxin reductase |
| XP_001318941.1 | Trichomonas vaginalis | [FeFe] Group A1 | Metamonada | Trichomonadida | Evolving | Labile | 1 | [FeFe]-centre | None, incomplete sequence |
| XP_001310180.1 | Trichomonas vaginalis | [FeFe] Group A1 | Metamonada | Trichomonadida | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| XP_001305709.1 | Trichomonas vaginalis | [FeFe] Group A1 | Metamonada | Trichomonadida | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_053379275.1 | Nitrospira moscoviensis | [NiFe] Group 2a | Nitrospirae | Nitrospirales | Aerobic Uptake | Tolerant | 5 | [NiFe]-centre, 2 x [4Fe4S] clusters, 1 x [3Fe4S] cluster | [FeS] protein, hypothetical proteins |
| WP_048100721.1 | Acidianus copahuensis | [NiFe] Group 1g | Crenarchaeota | Sulfolobales | Anaerobic Uptake | Unknown | 4 | [NiFe]-centre, 2 x [4Fe4S] clusters, 1 x [3Fe4S] cluster | Cytochrome b, [FeS] protein |
| WP_048100713.1 | Acidianus copahuensis | [NiFe] Group 1g | Crenarchaeota | Sulfolobales | Anaerobic Uptake | Unknown | 4 | [NiFe]-centre, 2 x [4Fe4S] clusters, 1 x [3Fe4S] cluster | Cytochrome b, [FeS] protein |
| WP_048100378.1 | Acidianus copahuensis | [NiFe] Group 1h | Crenarchaeota | Sulfolobales | Aerobic Uptake | Tolerant | 3 | [NiFe]-centre, 3 x [4Fe4S] clusters | [FeS] protein |
| WP_048100359.1 | Acidianus copahuensis | [NiFe] Group 2e | Crenarchaeota | Sulfolobales | Aerobic Uptake | Tolerant | 2 | [NiFe]-centre, 2 x [4Fe4S] clusters, 1 x [3Fe4S] cluster | None |
| WP_048090768.1 | Methanoperedens nitroreducens | [NiFe] Group 3b | Euryarchaeota | Methanosarcinales | Bidirectional | Tolerant | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Diaphorase, [FeS] protein |
| WP_048088262.1 | Methanoperedens nitroreducens | [NiFe] Group 3b | Euryarchaeota | Methanosarcinales | Bidirectional | Tolerant | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Diaphorase, [FeS] protein |
| WP_041979300.1 | Pyrinomonas methylaliphatogenes | [NiFe] Group 1h | Acidobacteria | Blastocatellia | Aerobic Uptake | Tolerant | 3 | [NiFe]-centre, 3 x [4Fe4S] clusters | [FeS] protein |
| WP_033162999.1 | Sharpea azabuensis | [FeFe] Group A2 | Firmicutes | Lactobacillales | Evolving | Labile | 2 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | NADH-dependent glutamate synthase |
| WP_032509674.1 | Peptoclostridium difficile | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_032508759.1 | Peptoclostridium difficile | [FeFe] Group B | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_032508101.1 | Peptoclostridium difficile | [FeFe] Group A3 | Firmicutes | Clostridiales | Bifurcating | Labile | 3 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | NADH dehydrogenase, thioredoxin |
| WP_031366038.1 | Lactococcus chungangensis | [FeFe] Group A3 | Firmicutes | Lactobacillales | Bifurcating | Labile | 3 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | NADH dehydrogenase, thioredoxin |
| WP_029968792.1 | Desulfonauticus sp. A7A | [NiFe] Group 1a | Deltaproteobacteria | Desulfovibrionales | Anaerobic Uptake | Sensitive | 3 | [NiFe]-centre, 3 x [4Fe4S] clusters | Cytochrome |
| WP_029967123.1 | Desulfonauticus sp. A7A | [NiFe] Group 4e | Deltaproteobacteria | Desulfovibrionales | Evolving | Sensitive | 6 | [NiFe]-centre, 1 x [4Fe4S] clusters | NuoL, NuoH, NuoC, [FeS] protein |
| WP_029966051.1 | Desulfonauticus sp. A7A | [NiFe] Group 1b | Deltaproteobacteria | Desulfovibrionales | Anaerobic Uptake | Sensitive | 3 | [NiFe]-centre, 2 x [4Fe4S] clusters, 1 x [3Fe4S] cluster | Cytochrome |
| WP_029966039.1 | Desulfonauticus sp. A7A | [NiFe] Group 3c | Deltaproteobacteria | Desulfovibrionales | Bifurcating | Sensitive | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Polyferredoxin, [FeS] protein |
| WP_029939087.1 | Thiomicrospira sp. MA2-6 | [NiFe] Group 1d | Gammaproteobacteria | Thiotrichales | Aerobic Uptake | Tolerant | 3 | [NiFe]-centre, 1 x [4Fe3S] cluster, 1 x [3Fe4S] cluster, 1 x [4Fe4S] cluster | Cytochrome b |
| WP_029933546.1 | Thiomicrospira pelophila | [FeFe] Group A1 | Gammaproteobacteria | Thiothrichales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_029918197.1 | Pelobacter seleniigenes | [FeFe] Group C3 | Deltaproteobacteria | Desulfuromonadales | Sensory | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters, PAS domain | Fusion with transcriptional activator |
| WP_029915222.1 | Pelobacter seleniigenes | [NiFe] Group 3b | Deltaproteobacteria | Desulfuromonadales | Bidirectional | Tolerant | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Diaphorase, [FeS] protein |
| WP_029915207.1 | Pelobacter seleniigenes | [NiFe] Group 1a | Deltaproteobacteria | Desulfobacterales | Anaerobic Uptake | Sensitive | 3 | [NiFe]-centre, 3 x [4Fe4S] clusters | Cytochrome |
| WP_029912396.1 | Pelobacter seleniigenes | [NiFe] Group 3b | Deltaproteobacteria | Desulfuromonadales | Bidirectional | Tolerant | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Diaphorase, [FeS] protein |
| WP_029909256.1 | Hydrogenovibrio marinus | [FeFe] Group A1 | Gammaproteobacteria | Thiothrichales | Evolving | Labile | 1 | [FeFe]-centre, 3 x [4Fe4S] clusters, 1 x [2Fe2S] cluster | None |
| WP_029908155.1 | Hydrogenovibrio marinus | [NiFe] Group 1d | Gammaproteobacteria | Thiotrichales | Aerobic Uptake | Tolerant | 3 | [NiFe]-centre, 1 x [4Fe3S] cluster, 1 x [3Fe4S] cluster, 1 x [4Fe4S] cluster | Cytochrome b |
| WP_029898901.1 | Desulfovibrio sp. L21-Syr-AB | [NiFe] Group 3c | Deltaproteobacteria | Desulfovibrionales | Bifurcating | Sensitive | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Polyferredoxin, [FeS] protein |