1HAO:
reference: An ambiguous structure of a DNA 15-mer thrombin complex., Padmanabhan K, Tulinsky A, Acta Crystallogr D Biol Crystallogr. 1996 Mar 1;52(Pt 2):272-82. PMID: 15299700

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