2JSL:
reference: Structure of two intramolecular G-quadruplexes formed by natural human telomere sequences in K+ solution., Phan AT, Kuryavyi V, Luu KN, Patel DJ, Nucleic Acids Res. 2007;35(19):6517-25. Epub 2007 Sep 25. PMID: 17895279

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