3MEI:
reference: Structure of an RNA dimer of a regulatory element from human thymidylate synthase mRNA., Dibrov S, McLean J, Hermann T, Acta Crystallogr D Biol Crystallogr. 2011 Feb;67(Pt 2):97-104. Epub 2011, Jan 8. PMID: 21245530

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