3EUL:
reference: 1.9 A structure of the signal receiver domain of the putative response regulator NarL from Mycobacterium tuberculosis., Schnell R, Agren D, Schneider G, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2008 Dec 1;64(Pt, 12):1096-100. Epub 2008 Nov 28. PMID: 19052358

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