| PF00115 | Cytochrome C and Quinol oxidase polypeptide I (COX1) | Cytochrome C and Quinol oxidase polypeptide I | - | Family |
| PF00116 | Cytochrome C oxidase subunit II, periplasmic domain (COX2) | Cytochrome C oxidase subunit II, periplasmic domain | - | Domain |
| PF06481 | COX Aromatic Rich Motif (COX_ARM) | COX Aromatic Rich Motif | - | Motif |
| PF00510 | Cytochrome c oxidase subunit III (COX3) | Cytochrome c oxidase subunit III | - | Family |
| PF03626 | Prokaryotic Cytochrome C oxidase subunit IV (COX4_pro) | Prokaryotic Cytochrome C oxidase subunit IV | - | Family |