2LUJ:
reference: Solution Structure of a Parallel-Stranded Oligoisoguanine DNA Pentaplex Formed by d(T(iG)(4) T) in the Presence of Cs(+) Ions., Kang M, Heuberger B, Chaput JC, Switzer C, Feigon J, Angew Chem Int Ed Engl. 2012 Jul 5. doi: 10.1002/anie.201203459. PMID: 22767484

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