Peptide sequence: FESPFTISDG IYGSTFFVAT GFHGLHVIIG STFLTICFIR QLMFHFTSKH Sequence homology: Human: 100%. COX3 is a multi-pass membrane protein. It belongs to the cytochrome c oxidase subunit 3 family. Defects in COX3 are a cause of Leber hereditary optic