3ULQ:
reference: Structural basis of response regulator inhibition by a bacterial anti-activator protein., Baker MD, Neiditch MB, PLoS Biol. 2011 Dec;9(12):e1001226. Epub 2011 Dec 27. PMID: 22215984

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