4XWZ:
reference: Crystal structure of the deglycating enzyme amadoriase i in its free form and substrate-bound complex., Rigoldi F, Gautieri A, Dalle Vedove A, Lucarelli AP, Vesentini S, Parisini E, Proteins. 2016 Feb 13. doi: 10.1002/prot.25015. PMID: 26873906

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