2K4B:
reference: The copper-responsive repressor CopR of Lactococcus lactis is a 'winged helix' protein., Cantini F, Banci L, Solioz M, Biochem J. 2009 Jan 15;417(2):493-9. PMID: 18837698

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