3IGY:
reference: Crystal Structures of Leishmania mexicana Phosphoglycerate Mutase Suggest a One-Metal Mechanism and a New Enzyme Subclass., Nowicki MW, Kuaprasert B, McNae IW, Morgan HP, Harding MM, Michels PA, Fothergill-Gilmore LA, Walkinshaw MD, J Mol Biol. 2009 Sep 23. PMID: 19781556

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