1F3S:
reference: A two-stranded template-based approach to G.(C-A) triad formation: designing novel structural elements into an existing DNA framework., Kettani A, Basu G, Gorin A, Majumdar A, Skripkin E, Patel DJ, J Mol Biol 2000 Aug 4;301(1):129-46. PMID: 10926497

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