5NDC:
reference: Serial femtosecond crystallography structure of cytochrome c oxidase at room temperature., Andersson R, Safari C, Dods R, Nango E, Tanaka R, Yamashita A, Nakane T, Tono K, Joti Y, Bath P, Dunevall E, Bosman R, Nureki O, Iwata S, Neutze R, Branden G, Sci Rep. 2017 Jul 3;7(1):4518. doi: 10.1038/s41598-017-04817-z. PMID: 28674417

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