2JXM:
reference: Dynamics in the transient complex of plastocyanin-cytochrome f from Prochlorothrix hollandica., Hulsker R, Baranova MV, Bullerjahn GS, Ubbink M, J Am Chem Soc. 2008 Feb 13;130(6):1985-91. Epub 2008 Jan 18. PMID: 18201089

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