2ILZ:
reference: Stabilization of Poliovirus Polymerase by NTP Binding and Fingers-Thumb Interactions., Thompson AA, Albertini RA, Peersen OB, J Mol Biol. 2007 Mar 9;366(5):1459-74. Epub 2006 Dec 1. PMID: 17223130

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