3RJX:
reference: Crystal structure of hyperthermophilic Endo-beta-1,4-glucanase: Implications for catalytic mechanism and thermostability., Zheng B, Yang W, Zhao X, Wang Y, Lou Z, Rao Z, Feng Y, J Biol Chem. 2011 Nov 29. PMID: 22128157

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