| C | MRAP_like | e5ir6C1 | A: extended segments | X: Bd-type quinol oxidase transmembrane helix subunit (From Topology) | H: Bd-type quinol oxidase transmembrane helix subunit (From Topology) | T: Bd-type quinol oxidase transmembrane helix subunit | F: MRAP_like | ECOD (1.6) |
| B | Cyt_bd_oxida_II_1st | e5ir6B1 | A: alpha bundles | X: Transmembrane heme-binding four-helical bundle (From Homology) | H: Transmembrane heme-binding four-helical bundle | T: Transmembrane di-heme cytochromes | F: Cyt_bd_oxida_II_1st | ECOD (1.6) |
| B | Cyt_bd_oxida_II_2nd | e5ir6B2 | A: alpha bundles | X: Transmembrane heme-binding four-helical bundle (From Homology) | H: Transmembrane heme-binding four-helical bundle | T: Transmembrane di-heme cytochromes | F: Cyt_bd_oxida_II_2nd | ECOD (1.6) |
| A | Cyt_bd_oxida_I_1st | e5ir6A2 | A: alpha bundles | X: Transmembrane heme-binding four-helical bundle (From Homology) | H: Transmembrane heme-binding four-helical bundle | T: Transmembrane di-heme cytochromes | F: Cyt_bd_oxida_I_1st | ECOD (1.6) |
| A | Cyt_bd_oxida_I_2nd | e5ir6A1 | A: alpha bundles | X: Transmembrane heme-binding four-helical bundle (From Homology) | H: Transmembrane heme-binding four-helical bundle | T: Transmembrane di-heme cytochromes | F: Cyt_bd_oxida_I_2nd | ECOD (1.6) |