1YLB:
reference: Structure of the Intermolecular Complex between Plastocyanin and Cytochrome f from Spinach., Musiani F, Dikiy A, Semenov AY, Ciurli S, J Biol Chem 2005 May 13;280(19):18833-18841. Epub 2005 Feb 3. PMID: 15691836

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