5B4S:
reference: Crystal structure of a family 80 chitosanase from Mitsuaria chitosanitabida., Yorinaga Y, Kumasaka T, Yamamoto M, Hamada K, Kawamukai M, FEBS Lett. 2017 Jan 13. doi: 10.1002/1873-3468.12557. PMID: 28084023

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