1VGJ:
reference: The structure of Pyrococcus horikoshii 2'-5' RNA ligase at 1.94 A resolution reveals a possible open form with a wider active-site cleft., Gao YG, Yao M, Okada A, Tanaka I, Acta Crystallograph Sect F Struct Biol Cryst Commun. 2006 Dec 1;62(Pt, 12):1196-200. Epub 2006 Nov 30. PMID: 17142895

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