3EDC:
reference: Crystal structure of a 1.6-hexanediol bound tetrameric form of Escherichia coli Lac-repressor refined to 2.1 A resolution., Stenberg KA, Vihinen M, Proteins. 2008 Sep 30. PMID: 19004002

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