3HTS:
reference: A new use for the 'wing' of the 'winged' helix-turn-helix motif in the HSF-DNA cocrystal., Littlefield O, Nelson HC, Nat Struct Biol 1999 May;6(5):464-70. PMID: 10331875

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