3NSB:
reference: X-ray-Radiation-Induced Changes in Bacteriorhodopsin Structure., Borshchevskiy VI, Round ES, Popov AN, Buldt G, Gordeliy VI, J Mol Biol. 2011 Apr 21. PMID: 21530535

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