2QXW:
reference: Quantum model of catalysis based on a mobile proton revealed by subatomic x-ray and neutron diffraction studies of h-aldose reductase., Blakeley MP, Ruiz F, Cachau R, Hazemann I, Meilleur F, Mitschler A, Ginell S, Afonine P, Ventura ON, Cousido-Siah A, Haertlein M, Joachimiak A, Myles D, Podjarny A, Proc Natl Acad Sci U S A. 2008 Feb 12;105(6):1844-8. Epub 2008 Feb 4. PMID: 18250329

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