1RNA:
reference: Crystallographic structure of an RNA helix: [U(UA)6A]2., Dock-Bregeon AC, Chevrier B, Podjarny A, Johnson J, de Bear JS, Gough GR, Gilham PT, Moras D, J Mol Biol 1989 Oct 5;209(3):459-74. PMID: 2479753

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