4QCB:
reference: Binding of undamaged double stranded DNA to vaccinia virus uracil-DNA Glycosylase., Schormann N, Banerjee S, Ricciardi R, Chattopadhyay D, BMC Struct Biol. 2015 Jun 2;15:10. doi: 10.1186/s12900-015-0037-1. PMID: 26031450

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