| 4PE5: reference: Crystal structure of a heterotetrameric NMDA receptor ion channel., Karakas E, Furukawa H, Science. 2014 May 30;344(6187):992-7. doi: 10.1126/science.1251915. PMID: 24876489 |
This OCA 
Structure page
uses Jmol,
developed by the Jmol Development Team
(documentation).