1JQR:
reference: Solution structure of a viral DNA polymerase X and evidence for a mutagenic function., Showalter AK, Byeon IJ, Su MI, Tsai MD, Nat Struct Biol 2001 Nov;8(11):942-6. PMID: 11685239

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