2RP1:
reference: Frameshifting RNA pseudoknots: structure and mechanism., Giedroc DP, Cornish PV, Virus Res. 2009 Feb;139(2):193-208. Epub 2008 Jul 25. PMID: 18621088

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