| Organism | Ratio1 | Gene1 | Name1 | Description1 | Ratio2 | Gene2 | Name2 | Description2 | Cofit | Rank |
| Shewanella oneidensis MR-1 | 1.0 | SO2097 | hydC | quinone-reactive Ni/Fe hydrogenase, cytochrome b subunit (NCBI ptt file) | 1.0 | SO2099 | hoxK | quinone-reactive Ni/Fe hydrogenase, small subunit precursor (NCBI ptt file) | 0.35 | 2 |
| Shewanella sp. ANA-3 | 0.98 | Shewana3_1878 | | Ni/Fe-hydrogenase, b-type cytochrome subunit (RefSeq) | 0.99 | Shewana3_1880 | | hydrogenase (NiFe) small subunit HydA (RefSeq) | low | > 73 |
| Shewanella loihica PV-4 | 0.77 | Shew_1763 | | Ni/Fe-hydrogenase, b-type cytochrome subunit (RefSeq) | 0.92 | Shew_1765 | | hydrogenase (NiFe) small subunit HydA (RefSeq) | low | > 60 |
| Shewanella amazonensis SB2B | 0.72 | Sama_1677 | | quinone-reactive Ni/Fe hydrogenase, cytochrome b subunit (RefSeq) | 0.94 | Sama_1679 | | hydrogen:quinone oxidoreductase (RefSeq) | low | > 62 |
| Variovorax sp. OAS795 | 0.19 | ABID97_RS13670 | | Ni/Fe-hydrogenase, b-type cytochrome subunit | 0.38 | ABID97_RS13685 | | hydrogenase small subunit | low | > 91 |
| Hydrogenophaga sp. GW460-11-11-14-LB1 | 0.19 | GFF2227 | | Ni,Fe-hydrogenase I cytochrome b subunit | 0.38 | GFF2230 | | Uptake hydrogenase small subunit precursor (EC 1.12.99.6) | low | > 90 |
| Xanthobacter sp. DMC5 | 0.16 | GFF4442 | | putative Ni/Fe-hydrogenase B-type cytochrome subunit | 0.39 | GFF4444 | | Uptake hydrogenase small subunit | — | — |
| Escherichia fergusonii Becca | 0.16 | EFB2_03097 | | putative Ni/Fe-hydrogenase 1 B-type cytochrome subunit | 0.36 | EFB2_03099 | | Hydrogenase-1 small chain | low | > 86 |
| Escherichia coli Nissle 1917 | 0.16 | ECOLIN_RS05120 | | Ni/Fe-hydrogenase b-type cytochrome subunit | 0.36 | ECOLIN_RS05110 | | hydrogenase 1 small subunit | low | > 55 |
| Escherichia coli ECRC100 | 0.16 | OKFHMN_04800 | hyaC | Ni/Fe-hydrogenase b-type cytochrome subunit | 0.36 | OKFHMN_04810 | hyaA | hydrogenase 1 small subunit | low | > 79 |
| Escherichia coli ECRC98 | 0.16 | JDDGAC_08410 | hyaC | Ni/Fe-hydrogenase b-type cytochrome subunit | 0.36 | JDDGAC_08420 | hyaA | hydrogenase 1 small subunit | low | > 87 |
| Escherichia coli BL21 | 0.16 | ECD_00977 | | hydrogenase 1, b-type cytochrome subunit | 0.36 | ECD_00975 | | hydrogenase 1, small subunit | low | > 61 |
| Escherichia coli ECOR38 | 0.16 | HEPCGN_23370 | hyaC | Ni/Fe-hydrogenase b-type cytochrome subunit | 0.36 | HEPCGN_23360 | hyaA | hydrogenase 1 small subunit | low | > 88 |
| Escherichia coli ECRC102 | 0.16 | NIAGMN_23050 | hyaC | Ni/Fe-hydrogenase b-type cytochrome subunit | 0.36 | NIAGMN_23040 | hyaA | hydrogenase 1 small subunit | low | > 80 |
| Escherichia coli HS(pFamp)R (ATCC 700891) | 0.16 | OHPLBJKB_02692 | | putative Ni/Fe-hydrogenase 1 B-type cytochrome subunit | 0.36 | OHPLBJKB_02694 | | Hydrogenase-1 small chain | low | > 74 |
| Escherichia coli ECRC101 | 0.16 | MCAODC_24185 | hyaC | Ni/Fe-hydrogenase b-type cytochrome subunit | 0.36 | MCAODC_24195 | hyaA | hydrogenase 1 small subunit | low | > 87 |
| Escherichia coli BW25113 | 0.16 | b0974 | hyaC | hydrogenase 1, b-type cytochrome subunit (NCBI) | 0.36 | b0972 | hyaA | hydrogenase 1, small subunit (NCBI) | 0.17 | 11 |
| Escherichia coli ECRC62 | 0.16 | BNILDI_19870 | hyaC | Ni/Fe-hydrogenase b-type cytochrome subunit | 0.36 | BNILDI_19880 | hyaA | hydrogenase 1 small subunit | low | > 75 |
| Escherichia coli ECRC99 | 0.16 | KEDOAH_22945 | hyaC | Ni/Fe-hydrogenase b-type cytochrome subunit | 0.36 | KEDOAH_22935 | hyaA | hydrogenase 1 small subunit | — | — |
| Escherichia coli ECOR27 | 0.16 | NOLOHH_21705 | hyaC | Ni/Fe-hydrogenase b-type cytochrome subunit | 0.36 | NOLOHH_21715 | hyaA | hydrogenase 1 small subunit | low | > 76 |
| Rhodopseudomonas palustris CGA009 | 0.15 | TX73_004965 | | Ni/Fe-hydrogenase, b-type cytochrome subunit | 0.40 | TX73_004955 | | hydrogenase small subunit | low | > 86 |
| Rhodospirillum rubrum S1H | 0.15 | Rru_A1163 | | Nickel-dependent hydrogenase b-type cytochrome subunit (NCBI) | 0.39 | Rru_A1161 | | Ni-Fe hydrogenase, small subunit (NCBI) | low | > 58 |
| Salmonella enterica subsp. enterica serovar Typhimurium str. MS1868 | 0.15 | GFF2523 | | Ni,Fe-hydrogenase I cytochrome b subunit | 0.38 | GFF2787 | | Uptake hydrogenase small subunit precursor (EC 1.12.99.6) | low | > 78 |
Not shown: 0 genomes with orthologs for SO2097 only; 7 genomes with orthologs for SO2099 only