4O1W:
reference: The structure of ferricytochrome c from the psychrophilic marine bacterium Colwellia psychrerythraea 34H., Harvilla PB, Wolcott HN, Magyar JS, Metallomics. 2014 Apr 14. PMID: 24727932

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).