| KEGG ID | KO | Definition |
| cel:CELE_E04A4.7 | K08738 | Cytochrome c 2.1 |
| cel:CELE_ZC116.2 | K08738 | putative cytochrome c 2.2 |
| cbr:CBG01744 | ||
| cbr:CBG08529 | ||
| bmy:Bm1_28235 | ||
| loa:LOAG_05968 | K08738 | cytochrome c type-1 |
| nai:NECAME_05086 | K08738 | cytochrome |
| nai:NECAME_13287 | K08738 | cytochrome |
| nai:NECAME_17775 | K08738 | cytochrome |
| lak:106156451 | K08738 | cytochrome c |
| lak:106160707 | K08738 | cytochrome c-like |