1NTC:
reference: Solution structure of the DNA-binding domain of NtrC with three alanine substitutions., Pelton JG, Kustu S, Wemmer DE, J Mol Biol 1999 Oct 8;292(5):1095-110. PMID: 10512705

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