3OGD:
reference: Structure of Escherichia coli AlkA in Complex with Undamaged DNA., Bowman BR, Lee S, Wang S, Verdine GL, J Biol Chem. 2010 Nov 12;285(46):35783-91. Epub 2010 Sep 15. PMID: 20843803

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