3QGC:
reference: Stacking interactions in PUF-RNA complexes., Koh YY, Wang Y, Qiu C, Opperman L, Gross L, Tanaka Hall TM, Wickens M, RNA. 2011 Apr;17(4):718-27. Epub 2011 Mar 3. PMID: 21372189

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