4Z9J:
reference: Structural Analysis of the Ligand-Binding Domain of the Aspartate Receptor Tar from Escherichia coli., Mise T, Biochemistry. 2016 Jul 5;55(26):3708-13. doi: 10.1021/acs.biochem.6b00160. Epub, 2016 Jun 20. PMID: 27292793

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