2VZV:
reference: The structural basis of substrate recognition in an exo-beta-D-glucosaminidase involved in chitosan hydrolysis., van Bueren AL, Ghinet MG, Gregg K, Fleury A, Brzezinski R, Boraston AB, J Mol Biol. 2009 Jan 9;385(1):131-9. Epub 2008 Oct 19. PMID: 18976664

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