1Y2L:
reference: Homology modeling and molecular dynamics simulations of the mu opioid receptor in a membrane-aqueous system., Zhang Y, Sham YY, Rajamani R, Gao J, Portoghese PS, Chembiochem. 2005 May;6(5):853-9. PMID: 15776407

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