1I4V:
reference: Converting a DNA damage checkpoint effector (UmuD2C) into a lesion bypass polymerase (UmuD'2C)., Ferentz AE, Walker GC, Wagner G, EMBO J 2001 Aug 1;20(15):4287-98. PMID: 11483531

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