3OGU:
reference: Human DNA polymerase beta mutations allowing efficient abasic site bypass., Gieseking S, Bergen K, Di Pasquale F, Diederichs K, Welte W, Marx A, J Biol Chem. 2011 Feb 4;286(5):4011-20. Epub 2010 Nov 24. PMID: 21107011

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