3KZI:
reference: Crystal structure of monomeric photosystem II from Thermosynechococcus elongatus at 3.6 A resolution., Broser M, Gabdulkhakov A, Kern J, Guskov A, Mueh F, Saenger W, Zouni A, J Biol Chem. 2010 Jun 17. PMID: 20558739

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