| WP_013412025.1 | Caldicellulosiruptor owensensis | [FeFe] Group C1 | Firmicutes | Thermoanaerobacterales | Sensory | Labile | 2 | [FeFe]-centre, 2 x [4Fe4S] clusters, PAS domain | Histidine kinase |
| WP_005026529.1 | Bilophila wadsworthia | [FeFe] Group A1 | Deltaproteobacteria | Desulfovibrionales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_027186285.1 | Desulfovibrio inopinatus | [FeFe] Group A4 | Deltaproteobacteria | Desulfovibrionales | Evolving | Labile | 3 | [FeFe]-centre, 2 x [4Fe4S] clusters | FeS protein, FeS protein |
| 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_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_041979300.1 | Pyrinomonas methylaliphatogenes | [NiFe] Group 1h | Acidobacteria | Blastocatellia | Aerobic Uptake | Tolerant | 3 | [NiFe]-centre, 3 x [4Fe4S] clusters | [FeS] protein |
| KKK40681.1 | Lokiarchaeum sp. GC14_75 | [NiFe] Group 3c | Lokiarchaeota | N/A | Bifurcating | Sensitive | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Polyferredoxin, [FeS] protein |
| 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_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 |
| CUU03002.1 | Kryptonium thompsoni | [NiFe] Group 1d | Kryptonia | N/A | Aerobic Uptake | Tolerant | 3 | [NiFe]-centre, 1 x [4Fe3S] cluster, 1 x [3Fe4S] cluster, 1 x [4Fe4S] cluster | Cytochrome b |
| CUU06124.1 | Kryptonium thompsoni | [NiFe] Group 3b | Kryptonia | N/A | Bidirectional | Tolerant | 4 | [NiFe]-centre, 3 x [4Fe4S] clusters | Diaphorase, [FeS] protein |
| WP_004081666.1 | Thermotoga maritima | [FeFe] Group C3 | Thermotogae | Thermotogales | Sensory | Sensitive | 2 | [FeFe]-centre, 2 x [4Fe4S] clusters, PAS domain | Phosphatase |