3MFI:
reference: Structural basis for the suppression of skin cancers by DNA polymerase eta., Silverstein TD, Johnson RE, Jain R, Prakash L, Prakash S, Aggarwal AK, Nature. 2010 Jun 24;465(7301):1039-43. PMID: 20577207

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