2OQR:
reference: The structure of a full-length response regulator from mycobacterium tuberculosis in a stabilised 3D domain-swapped, activated state., King-Scott J, Nowak E, Mylonas E, Panjikar S, Roessle M, Svergun DI, Tucker PA, J Biol Chem. 2007 Oct 16;. PMID: 17942407

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