3COP:
reference: The crystal structures of the open and catalytically competent closed conformation of Escherichia coli glycogen synthase., Sheng F, Jia X, Yep A, Preiss J, Geiger JH, J Biol Chem. 2009 Feb 25. PMID: 19244233

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