2M8Y:
reference: Structural Basis of DNA Quadruplex-Duplex Junction Formation., Lim KW, Phan AT, Angew Chem Int Ed Engl. 2013 Jun 21. doi: 10.1002/anie.201302995. PMID: 23794476

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