1MQJ:
reference: Structural basis for partial agonist action at ionotropic glutamate receptors., Jin R, Banke TG, Mayer ML, Traynelis SF, Gouaux E, Nat Neurosci. 2003 Aug;6(8):803-10. PMID: 12872125

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