2EWN:
reference: Co-repressor Induced Order and Biotin Repressor Dimerization: A Case for Divergent Followed by Convergent Evolution., Wood ZA, Weaver LH, Brown PH, Beckett D, Matthews BW, J Mol Biol. 2006 Jan 6;. PMID: 16438984

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