2ASR:
reference: The three-dimensional structure of the aspartate receptor from Escherichia coli., Bowie JU, Pakula AA, Simon MI, Acta Crystallogr D Biol Crystallogr. 1995 Mar 1;51(Pt 2):145-54. PMID: 15299315

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