1VF5:
reference: Structure of the cytochrome b6f complex of oxygenic photosynthesis: tuning the cavity., Kurisu G, Zhang H, Smith JL, Cramer WA, Science 2003 Nov 7;302(5647):1009-14. Epub 2003 Oct 2. PMID: 14526088

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