6USU:
reference: Structural Basis of Functional Transitions in Mammalian NMDA Receptors., Chou TH, Tajima N, Romero-Hernandez A, Furukawa H, Cell. 2020 Jul 23;182(2):357-371.e13. doi: 10.1016/j.cell.2020.05.052. Epub 2020 , Jun 30. PMID: 32610085

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