1K61:
reference: A Hoogsteen base pair embedded in undistorted B-DNA., Aishima J, Gitti RK, Noah JE, Gan HH, Schlick T, Wolberger C, Nucleic Acids Res 2002 Dec 1;30(23):5244-52. PMID: 12466549

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