331D:
reference: Crystal structure of d(GCGCGCG) with 5'-overhang G residues., Pan B, Ban C, Wahl MC, Sundaralingam M, Biophys J 1997 Sep;73(3):1553-61. PMID: 9284322

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