2Y8K:
reference: The structure and function of an arabinoxylan-specific xylanase., Correia MA, Mazumder K, Bras JL, Firbank SJ, Zhu Y, Lewis RJ, York WS, Fontes CM, Gilbert HJ, J Biol Chem. 2011 Mar 4. PMID: 21378160

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