| B [auth 4B] | IPR011759 | Cytochrome C oxidase subunit II, transmembrane domain | Domain |
| B [auth 4B] | IPR036257 | Cytochrome C oxidase subunit II, transmembrane domain superfamily | Homologous Superfamily |
| B [auth 4B] | IPR034210 | Cytochrome c oxidase subunit 2, C-terminal | Domain |
| B [auth 4B] | IPR045187 | Cytochrome c/quinol oxidase subunit II | Family |
| B [auth 4B] | IPR002429 | Cytochrome c oxidase subunit II-like C-terminal | Domain |
| B [auth 4B] | IPR008972 | Cupredoxin | Homologous Superfamily |
| B [auth 4B] | IPR001505 | Copper centre Cu(A) | Binding Site |
| B [auth 4B] | IPR014222 | Cytochrome c oxidase, subunit II | Domain |
| C [auth 4C] | IPR035973 | Cytochrome c oxidase subunit III-like superfamily | Homologous Superfamily |
| C [auth 4C] | IPR013833 | Cytochrome c oxidase, subunit III, 4-helical bundle | Homologous Superfamily |
| C [auth 4C] | IPR000298 | Cytochrome c oxidase subunit III-like | Domain |
| C [auth 4C] | IPR033945 | Cytochrome c oxidase subunit III domain | Domain |
| C [auth 4C] | IPR024791 | Cytochrome c oxidase subunit III | Family |
| F [auth 4F] | IPR002124 | Cytochrome c oxidase, subunit Vb | Family |
| F [auth 4F] | IPR036972 | Cytochrome c oxidase, subunit Vb superfamily | Homologous Superfamily |
| N [auth 4N] | IPR010530 | NADH-ubiquinone reductase complex 1 MLRQ subunit | Family |
| I [auth 4I] | IPR037169 | Mitochondrial cytochrome c oxidase subunit VIc/VIIs superfamily | Homologous Superfamily |
| I [auth 4I] | IPR051389 | Cytochrome c oxidase subunit VIc | Family |
| I [auth 4I] | IPR034884 | Mitochondrial cytochrome c oxidase subunit VIc/VIIs | Family |
| H [auth 4H] | IPR036549 | Cytochrome c oxidase subunit 6B/Cytochrome c oxidase assembly factor 6-like superfamily | Homologous Superfamily |
| H [auth 4H] | IPR048280 | Cytochrome oxidase c subunit VIb-like | Family |
| H [auth 4H] | IPR003213 | Cytochrome c oxidase, subunit VIb | Family |
| G [auth 4G] | IPR018507 | Cytochrome c oxidase, subunit VIa, conserved site | Conserved Site |
| G [auth 4G] | IPR036418 | Cytochrome c oxidase, subunit VIa superfamily | Homologous Superfamily |
| G [auth 4G] | IPR001349 | Cytochrome c oxidase, subunit VIa | Family |
| E [auth 4E] | IPR003204 | Cytochrome c oxidase, subunit Va/VI | Family |
| E [auth 4E] | IPR036545 | Cytochrome c oxidase, subunit Va/VI superfamily | Homologous Superfamily |
| D [auth 4D] | IPR004203 | Cytochrome c oxidase subunit IV family | Family |
| D [auth 4D] | IPR013288 | Cytochrome c oxidase subunit IV | Family |
| D [auth 4D] | IPR036639 | Cytochrome c oxidase subunit IV superfamily | Homologous Superfamily |
| M [auth 4M] | IPR003205 | Cytochrome c oxidase, subunit 8 | Family |
| M [auth 4M] | IPR036548 | Cytochrome c oxidase, subunit 8 superfamily | Homologous Superfamily |
| L [auth 4L] | IPR036636 | Cytochrome c oxidase subunit VIIc superfamily | Homologous Superfamily |
| L [auth 4L] | IPR004202 | Cytochrome c oxidase subunit VIIc | Family |
| K [auth 4K] | IPR023272 | Cytochrome C oxidase, subunit VIIB domain superfamily | Homologous Superfamily |
| K [auth 4K] | IPR008433 | Cytochrome C oxidase, subunit VIIB | Family |
| J [auth 4J] | IPR003177 | Cytochrome c oxidase subunit VIIa, metazoa | Family |
| J [auth 4J] | IPR036539 | Cytochrome c oxidase, subunit VIIa superfamily | Homologous Superfamily |
| J [auth 4J] | IPR039297 | Cytochrome c oxidase subunit VII | Family |
| A [auth 4A] | IPR036927 | Cytochrome c oxidase-like, subunit I superfamily | Homologous Superfamily |
| A [auth 4A] | IPR000883 | Cytochrome c oxidase subunit I | Family |
| A [auth 4A] | IPR023615 | Cytochrome c oxidase, subunit I, copper-binding site | Binding Site |
| A [auth 4A] | IPR023616 | Cytochrome c oxidase-like, subunit I domain | Domain |
| A [auth 4A] | IPR033944 | Cytochrome c oxidase subunit I domain | Domain |