2X60:
reference: Structural insights into the catalytic mechanism of bacterial guanosine-diphospho-D-mannose pyrophosphorylase and its regulation by divalent ions., Pelissier MC, Lesley SA, Kuhn P, Bourne Y, J Biol Chem. 2010 Jun 23. PMID: 20573954

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