1CW9:
reference: A structural snapshot of base-pair opening in DNA., van Aalten DM, Erlanson DA, Verdine GL, Joshua-Tor L, Proc Natl Acad Sci U S A 1999 Oct 12;96(21):11809-14. PMID: 10518532

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