3PDK:
reference: Crystal Structure of Bacillus anthracis Phosphoglucosamine Mutase, an Enzyme in the Peptidoglycan Biosynthetic Pathway., Mehra-Chaudhary R, Mick J, Beamer LJ, J Bacteriol. 2011 Aug;193(16):4081-7. Epub 2011 Jun 17. PMID: 21685296

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