2K90:
reference: Self-association of short DNA loops through minor groove C:G:G:C tetrads., Viladoms J, Escaja N, Frieden M, Gomez-Pinto I, Pedroso E, Gonzalez C, Nucleic Acids Res. 2009 Mar 24. PMID: 19321501

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