2JKA:
reference: Divergence of Catalytic Mechanism within a Glycosidase Family Provides Insight into Evolution of Carbohydrate Metabolism by Human Gut Flora., Gloster TM, Turkenburg JP, Potts JR, Henrissat B, Davies GJ, Chem Biol. 2008 Oct 20;15(10):1058-67. Epub 2008 Oct 9. PMID: 18848471

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