4QO5:
reference: In meso crystal structure of a novel membrane-associated octaheme cytochrome c from the Crenarchaeon Ignicoccus hospitalis., Parey K, Fielding AJ, Sorgel M, Rachel R, Huber H, Ziegler C, Rajendran C, FEBS J. 2016 Sep 1. doi: 10.1111/febs.13870. PMID: 27586496

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