4L17:
reference: A conformational intermediate in glutamate receptor activation., Lau AY, Salazar H, Blachowicz L, Ghisi V, Plested AJ, Roux B, Neuron. 2013 Aug 7;79(3):492-503. doi: 10.1016/j.neuron.2013.06.003. PMID: 23931998

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