3ANA:
reference: Three-dimensional structure of d(GGGATCCC) in the crystalline state., Lauble H, Frank R, Blocker H, Heinemann U, Nucleic Acids Res 1988 Aug 25;16(16):7799-816. PMID: 3166518

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