3OSP:
reference: DNA synthesis across an abasic lesion by yeast REV1 DNA polymerase., Nair DT, Johnson RE, Prakash L, Prakash S, Aggarwal AK, J Mol Biol. 2011 Feb 11;406(1):18-28. Epub 2010 Dec 15. PMID: 21167175

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