3DNB:
reference: Structure of the B-DNA decamer C-C-A-A-C-G-T-T-G-G and comparison with isomorphous decamers C-C-A-A-G-A-T-T-G-G and C-C-A-G-G-C-C-T-G-G., Prive GG, Yanagi K, Dickerson RE, J Mol Biol 1991 Jan 5;217(1):177-99. PMID: 1988677

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