3CQS:
reference: Shared traits on the reaction coordinates of ribonuclease and an RNA enzyme., Torelli AT, Spitale RC, Krucinska J, Wedekind JE, Biochem Biophys Res Commun. 2008 Jun 20;371(1):154-8. Epub 2008 Apr 16. PMID: 18423397

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