Electron carrier protein. The oxidized form of the cytochrome c heme group can accept an electron from the heme group of the cytochrome c1 subunit of cytochrome reductase. Cytochrome c then transfers this electron to the cytochrome oxidase complex, the final protein carrier in the mitochondrial electron-transport chain. Loosely associated with the inner membrane. Binds 1 c group covalently group per subunit. Belongs to the cytochrome c family. Life shuttle - Issue 76 of November 2006