2GZ6:
reference: The Central Cavity from the (Alpha/Alpha)(6) Barrel Structure of Anabaena sp. CH1 N-Acetyl-d-glucosamine 2-Epimerase Contains Two Key Histidine Residues for Reversible Conversion., Lee YC, Wu HM, Chang YN, Wang WC, Hsu WH, J Mol Biol. 2006 Nov 6;. PMID: 17292397

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