1YCC:
reference: High-resolution refinement of yeast iso-1-cytochrome c and comparisons with other eukaryotic cytochromes c., Louie GV, Brayer GD, J Mol Biol 1990 Jul 20;214(2):527-55. PMID: 2166169

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