3LAP:
reference: Crystal Structure of the Intermediate Complex of the Arginine Repressor from Mycobacterium tuberculosis Bound with Its DNA Operator Reveals Detailed Mechanism of Arginine Repression., Cherney LT, Cherney MM, Garen CR, James MN, J Mol Biol. 2010 Apr 9. PMID: 20382162

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