| Organism | Ratio1 | Gene1 | Name1 | Description1 | Ratio2 | Gene2 | Name2 | Description2 | Cofit | Rank |
| Azospirillum sp. SherDot2 | 1.0 | MPMX19_00209 | | Cbb3-type cytochrome c oxidase subunit FixP | 1.0 | MPMX19_00907 | | putative oxidoreductase YciK | 0.64 | 5 |
| Azospirillum brasilense Sp245 | 0.84 | AZOBR_RS01165 | | cytochrome CBB3 | 0.80 | AZOBR_RS08305 | | oxidoreductase | — | — |
| Magnetospirillum magneticum AMB-1 | 0.50 | AMB_RS22080 | | cytochrome-c oxidase, cbb3-type subunit III | 0.54 | AMB_RS10540 | | KR domain-containing protein | — | — |
| Rhodopseudomonas palustris CGA009 | 0.50 | TX73_000085 | | cytochrome-c oxidase, cbb3-type subunit III | 0.45 | TX73_015995 | | SDR family NAD(P)-dependent oxidoreductase | — | — |
| Rhizobium sp. OAE497 | 0.49 | ABIE40_RS26155 | | cytochrome-c oxidase, cbb3-type subunit III | 0.46 | ABIE40_RS06265 | | SDR family NAD(P)-dependent oxidoreductase | low | > 107 |
| Agrobacterium fabrum C58 | 0.48 | Atu1534 | | cytochrome-c oxidase, FixP chain | 0.45 | Atu1074 | | NAD/NADP dependent oxidoreductase | 0.43 | 16 |
| Xanthobacter sp. DMC5 | 0.47 | GFF4625 | | Cbb3-type cytochrome c oxidase subunit FixP | 0.45 | GFF1874 | | putative oxidoreductase YciK | — | — |
| Sinorhizobium meliloti 1021 | 0.47 | SMa0769 | | FixP2 Diheme c-type cytochrome | 0.43 | SMc00553 | | oxidoreductase | — | — |
| Bosea sp. OAE506 | 0.44 | ABIE41_RS10550 | | cytochrome-c oxidase, cbb3-type subunit III | 0.43 | ABIE41_RS17815 | | SDR family NAD(P)-dependent oxidoreductase | low | > 77 |
| Sphingobium sp. HT1-2 | 0.43 | GFF4334 | | Cytochrome c oxidase (cbb3-type) subunit CcoP (EC 1.9.3.1) | 0.35 | GFF78 | | Putative oxidoreductase | low | > 95 |
| Caulobacter crescentus NA1000 | 0.43 | CCNA_01470 | | cytochrome cbb3 oxidase, diheme subunit, membrane-bound ccoP | 0.49 | CCNA_01728 | | short chain dehydrogenase | low | > 66 |
| Caulobacter crescentus NA1000 Δfur | 0.43 | CCNA_01470 | | cytochrome cbb3 oxidase, diheme subunit, membrane-bound ccoP | 0.49 | CCNA_01728 | | short chain dehydrogenase | low | > 67 |
| Dinoroseobacter shibae DFL-12 | 0.42 | Dshi_0664 | | cytochrome c oxidase, cbb3-type, subunit III (RefSeq) | 0.32 | Dshi_2135 | | short-chain dehydrogenase/reductase SDR (RefSeq) | — | — |
| Phaeobacter inhibens DSM 17395 | 0.41 | PGA1_c30090 | | cytochrome c oxidase subunit 3 | 0.23 | PGA1_c10780 | | putative short chain dehydrogenase | — | — |
| Rhodospirillum rubrum S1H | 0.41 | Rru_A3330 | | Cytochrome c oxidase cbb3-type, subunit III (NCBI) | 0.55 | Rru_A0403 | | Short-chain dehydrogenase/reductase SDR (NCBI) | — | — |
| Vibrio cholerae E7946 ATCC 55056 | 0.29 | CSW01_07215 | | cytochrome-c oxidase, cbb3-type subunit III | 0.31 | CSW01_05390 | | YciK family oxidoreductase | low | > 62 |
| Marinobacter adhaerens HP15 | 0.29 | HP15_2110 | | cytochrome c oxidase, cbb3-type, subunit III | 0.28 | HP15_1225 | | oxidoreductase, short chain dehydrogenase/reductase family | — | — |
| Kangiella aquimarina DSM 16071 | 0.29 | B158DRAFT_1969 | | cytochrome c oxidase, cbb3-type, subunit III | 0.32 | B158DRAFT_2314 | | Dehydrogenases with different specificities (related to short-chain alcohol dehydrogenases) | 0.73 | 11 |
| Shewanella amazonensis SB2B | 0.28 | Sama_1794 | | cytochrome c oxidase, cbb3-type, subunit III (RefSeq) | 0.26 | Sama_2121 | | short chain dehydrogenase (RefSeq) | 0.70 | 24 |
| Shewanella loihica PV-4 | 0.28 | Shew_1988 | | cytochrome c oxidase, cbb3-type, subunit III (RefSeq) | 0.25 | Shew_2409 | | short chain dehydrogenase (RefSeq) | — | — |
| Shewanella sp. ANA-3 | 0.27 | Shewana3_2110 | | cytochrome c oxidase, cbb3-type, subunit III (RefSeq) | 0.25 | Shewana3_1528 | | short chain dehydrogenase (RefSeq) | 0.78 | 13 |
| Shewanella oneidensis MR-1 | 0.27 | SO2361 | ccoP | cytochrome c oxidase, cbb3-type, subunit III (NCBI ptt file) | 0.26 | SO2935 | | oxidoreductase, short-chain dehydrogenase/reductase family (NCBI ptt file) | 0.83 | 8 |
| Pseudomonas stutzeri RCH2 | 0.27 | Psest_2530 | | cytochrome c oxidase, cbb3-type, subunit III | 0.22 | Psest_2000 | | Dehydrogenases with different specificities (related to short-chain alcohol dehydrogenases) | 0.73 | 4 |
| Alteromonas macleodii MIT1002 | 0.26 | MIT1002_02132 | | Cytochrome c oxidase subunit III | 0.28 | MIT1002_01965 | | putative oxidoreductase YciK | low | > 70 |
| Pseudomonas orientalis W4I3 | 0.25 | QF045_RS22530 | | cytochrome-c oxidase, cbb3-type subunit III | 0.22 | QF045_RS10810 | | YciK family oxidoreductase | low | > 93 |
| Rhodanobacter sp. FW510-T8 | 0.24 | OKGIIK_07670 | ccoP | cytochrome-c oxidase, cbb3-type subunit III | 0.21 | OKGIIK_03065 | yqjQ | Short-chain dehydrogenase | low | > 53 |
| Rhodanobacter sp000427505 FW510-R12 | 0.24 | LRK53_RS11795 | | cytochrome-c oxidase, cbb3-type subunit III | 0.22 | LRK53_RS14770 | | SDR family NAD(P)-dependent oxidoreductase | low | > 59 |
| Rhodanobacter denitrificans MT42 | 0.23 | LRK55_RS17440 | | cytochrome-c oxidase, cbb3-type subunit III | 0.22 | LRK55_RS13545 | | SDR family NAD(P)-dependent oxidoreductase | low | > 63 |
| Rhodanobacter denitrificans FW104-10B01 | 0.23 | LRK54_RS17215 | | cytochrome-c oxidase, cbb3-type subunit III | 0.22 | LRK54_RS13830 | | SDR family NAD(P)-dependent oxidoreductase | 0.59 | 9 |
| Dyella japonica UNC79MFTsu3.2 | 0.23 | ABZR86_RS04435 | | cytochrome-c oxidase, cbb3-type subunit III | 0.20 | ABZR86_RS09815 | | SDR family NAD(P)-dependent oxidoreductase | low | > 74 |
Not shown: 36 genomes with orthologs for MPMX19_00209 only; 18 genomes with orthologs for MPMX19_00907 only