4GLE:
reference: UV damage endonuclease employs a novel dual-dinucleotide flipping mechanism to recognize different DNA lesions., Meulenbroek EM, Peron Cane C, Jala I, Iwai S, Moolenaar GF, Goosen N, Pannu NS, Nucleic Acids Res. 2012 Dec 11. PMID: 23221644

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