2DD3:
reference: An Alternating Sheared AA Pair and Elements of Stability for a Single Sheared Purine-Purine Pair Flanked by Sheared GA Pairs in RNA(,)., Chen G, Kennedy SD, Qiao J, Krugh TR, Turner DH, Biochemistry. 2006 Jun 6;45(22):6889-6903. PMID: 16734425

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