4GPA:
reference: Comparative Dynamics of NMDA- and AMPA-Glutamate Receptor N-Terminal Domains., Dutta A, Shrivastava IH, Sukumaran M, Greger IH, Bahar I, Structure. 2012 Sep 5. PMID: 22959625

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