| WP_004030875.1 | Methanobacterium formicicum | [Fe] | Euryarchaeota | Methanobacteriales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_012955328.1 | Methanobrevibacter ruminantium | [Fe] | Euryarchaeota | Methanobacteriales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_019263574.1 | Methanobrevibacter smithii | [Fe] | Euryarchaeota | Methanobacteriales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_016357634.1 | Methanobrevibacter sp. AbM4 | [Fe] | Euryarchaeota | Methanobacteriales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_013296316.1 | Methanothermobacter marburgensis | [Fe] | Euryarchaeota | Methanobacteriales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_010876766.1 | Methanothermobacter thermautotrophicus | [Fe] | Euryarchaeota | Methanobacteriales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_013413799.1 | Methanothermus fervidus | [Fe] | Euryarchaeota | Methanobacteriales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_015791545.1 | Methanocaldococcus fervens | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_013100253.1 | Methanocaldococcus infernus | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_010870290.1 | Methanocaldococcus jannaschii | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_012980975.1 | Methanocaldococcus sp. FS406-22 | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_004591226.1 | Methanocaldococcus villosus | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_012819445.1 | Methanocaldococcus vulcanius | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_011973735.1 | Methanococcus aeolicus | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_011869295.1 | Methanococcus maripaludis | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_012065947.1 | Methanococcus vannielii | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_013180733.1 | Methanococcus voltae | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_013866724.1 | Methanothermococcus okinawensis | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_018153721.1 | Methanothermococcus thermolithotrophicus | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_007044258.1 | Methanotorris formicicus | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_013799270.1 | Methanotorris igneus | [Fe] | Euryarchaeota | Methanococcales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_011834108.1 | Methanocorpusculum labreanum | [Fe] | Euryarchaeota | Methanomicrobiales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_013329929.1 | Methanoplanus petrolearius | [Fe] | Euryarchaeota | Methanomicrobiales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_015284887.1 | Methanoregula formicica | [Fe] | Euryarchaeota | Methanomicrobiales | Bidirectional | Tolerant | 1 | Fe ion | None |
| WP_011018385.1 | Methanopyrus kandleri | [Fe] | Euryarchaeota | Methanopyrales | Bidirectional | Tolerant | 1 | Fe ion | None |
| XP_001318941.1 | Trichomonas vaginalis | [FeFe] Group A1 | Metamonada | Trichomonadida | Evolving | Labile | 1 | [FeFe]-centre | None, incomplete sequence |
| XP_001693376.1 | Chlamydomonas reinhardtii | [FeFe] Group A1 | Chlorophyta | Chlamydomonadales | Evolving | Labile | 1 | [FeFe]-centre | None |
| XP_001694503.1 | Chlamydomonas reinhardtii | [FeFe] Group A1 | Chlorophyta | Chlamydomonadales | Evolving | Labile | 1 | [FeFe]-centre | None |
| XP_002948483.1 | Volvox carteri | [FeFe] Group A1 | Chlorophyta | Volvocales | Evolving | Labile | 1 | [FeFe]-centre | None |
| XP_002956049.1 | Volvox carteri | [FeFe] Group A1 | Chlorophyta | Volvocales | Evolving | Labile | 1 | [FeFe]-centre | None |
| XP_005843810.1 | Chlorella variabilis | [FeFe] Group A1 | Chlorophyta | Chlorellales | Evolving | Labile | 1 | [FeFe]-centre | None |
| XP_005854537.1 | Nannochloropsis gaditana | [FeFe] Group A1 | Heterokonta | Eustigmatales | Evolving | Labile | 1 | [FeFe]-centre | None |
| WP_019554692.1 | Zymophilus raffinosivorans | [FeFe] Group B | Firmicutes | Selenomonadales | Evolving | Labile | 1 | [FeFe]-centre | None |
| WP_002568840.1 | Lachnoclostridium bolteae | [FeFe] Group A1 | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_002607524.1 | Erysipelatoclostridium innocuum | [FeFe] Group A1 | Firmicutes | Erysipelotrichales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_002945014.1 | Campylobacter rectus | [FeFe] Group A1 | Epsilonproteobacteria | Campylobacterales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_004607406.1 | Lachnoclostridium scindens | [FeFe] Group A1 | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_004697562.1 | Veillonella parvula | [FeFe] Group A1 | Firmicutes | Selenomonadales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005026529.1 | Bilophila wadsworthia | [FeFe] Group A1 | Deltaproteobacteria | Desulfovibrionales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005038203.1 | Holophaga foetida | [FeFe] Group A1 | Acidobacteria | Holophagales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005351469.1 | Eubacterium hallii | [FeFe] Group A1 | Firmicutes | Clostridiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005375825.1 | Veillonella atypica | [FeFe] Group A1 | Firmicutes | Selenomonadales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005378576.1 | Veillonella atypica | [FeFe] Group A1 | Firmicutes | Selenomonadales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005382858.1 | Veillonella atypica | [FeFe] Group A1 | Firmicutes | Selenomonadales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005384713.1 | Veillonella atypica | [FeFe] Group A1 | Firmicutes | Selenomonadales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005384882.1 | Veillonella dispar | [FeFe] Group A1 | Firmicutes | Selenomonadales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005385706.1 | Veillonella dispar | [FeFe] Group A1 | Firmicutes | Selenomonadales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005436344.1 | Sutterella wadsworthensis | [FeFe] Group A1 | Betaproteobacteria | Burkholderiales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005884626.1 | Fusobacterium mortiferum | [FeFe] Group A1 | Fusobacteria | Fusobacteriales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |
| WP_005886368.1 | Fusobacterium mortiferum | [FeFe] Group A1 | Fusobacteria | Fusobacteriales | Evolving | Labile | 1 | [FeFe]-centre, 2 x [4Fe4S] clusters | None |