2B0Y:
reference: Unique helical conformation of the fourth cytoplasmic loop of the CB1 cannabinoid receptor in a negatively charged environment., Grace CR, Cowsik SM, Shim JY, Welsh WJ, Howlett AC, J Struct Biol. 2007 Sep;159(3):359-68. Epub 2007 Apr 20. PMID: 17524664

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