2GQQ:
reference: Structure of the Escherichia coli leucine-responsive regulatory protein Lrp reveals a novel octameric assembly., de los Rios S, Perona JJ, J Mol Biol. 2007 Mar 9;366(5):1589-602. Epub 2006 Dec 19. PMID: 17223133

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