1DA3:
reference: The crystal structure of the trigonal decamer C-G-A-T-C-G-6meA-T-C-G: a B-DNA helix with 10.6 base-pairs per turn., Baikalov I, Grzeskowiak K, Yanagi K, Quintana J, Dickerson RE, J Mol Biol 1993 Jun 5;231(3):768-84. PMID: 8515450

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