4J50:
reference: A dynamic structural model of expanded RNA CAG repeats: a refined X-ray structure and computational investigations using molecular dynamics and umbrella sampling simulations., Yildirim I, Park H, Disney MD, Schatz GC, J Am Chem Soc. 2013 Mar 6;135(9):3528-38. doi: 10.1021/ja3108627. Epub 2013 Feb, 26. PMID: 23441937

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