5H4U:
reference: Genetic and Structural Characterization of a Thermo-Tolerant, Cold-Active, and Acidic Endo-beta-1,4-glucanase from Antarctic Springtail, Cryptopygus antarcticus., Song JM, Hong SK, An YJ, Kang MH, Hong KH, Lee YH, Cha SS, J Agric Food Chem. 2017 Mar 1;65(8):1630-1640. doi: 10.1021/acs.jafc.6b05037., Epub 2017 Feb 16. PMID: 28156112

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