1TQR:
reference: Pre-organized structure of viral DNA at the binding-processing site of HIV-1 integrase., Renisio JG, Cosquer S, Cherrak I, El Antri S, Mauffret O, Fermandjian S, Nucleic Acids Res 2005 Apr 6;33(6):1970-81. Print 2005. PMID: 15814814

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