1YQR:
reference: Structure of a repair enzyme interrogating undamaged DNA elucidates recognition of damaged DNA., Banerjee A, Yang W, Karplus M, Verdine GL, Nature. 2005 Mar 31;434(7033):612-8. PMID: 15800616

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