5ANA:
reference: The crystal structure of d(GTACGTAC) at 2.25 A resolution: are the A-DNA's always unwound approximately 10 degrees at the C-G steps?, Takusagawa F, J Biomol Struct Dyn 1990 Feb;7(4):795-809. PMID: 2310515

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