4FBZ:
reference: Crystal structure of deltarhodopsin-3 from haloterrigena thermotolerans., Zhang J, Mizuno K, Murata Y, Koide H, Murakami M, Ihara K, Kouyama T, Proteins. 2013 Apr 29. doi: 10.1002/prot.24316. PMID: 23625688

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