1NNP:
reference: Three-dimensional structure of the ligand-binding core of GluR2 in complex with the agonist (S)-ATPA: implications for receptor subunit selectivity., Lunn ML, Hogner A, Stensbol TB, Gouaux E, Egebjerg J, Kastrup JS, J Med Chem 2003 Feb 27;46(5):872-5. PMID: 12593667

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