5cyt is a 1 chain structure with sequence from Albacore. This structure supersedes the now removed PDB entries 4cyt and 2cyt. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
[CYC_THUAA] 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.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.