1D90:
reference: Refined crystal structure of an octanucleotide duplex with I.T. mismatched base pairs., Cruse WB, Aymani J, Kennard O, Brown T, Jack AG, Leonard GA, Nucleic Acids Res 1989 Jan 11;17(1):55-72. PMID: 2911488

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