201D:
reference: Solution structure of the Oxytricha telomeric repeat d[G4(T4G4)3] G-tetraplex., Wang Y, Patel DJ, J Mol Biol 1995 Aug 4;251(1):76-94. PMID: 7643391

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