1ZYF:
reference: Structural and dynamic basis of a supercoiling-responsive DNA element., Bae SH, Yun SH, Sun D, Lim HM, Choi BS, Nucleic Acids Res. 2006 Jan 9;34(1):254-61. Print 2006. PMID: 16414956

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