4MCK:
reference: Crystallographic structure of ChitA, a glycoside hydrolase family 19, plant class IV chitinase from Zea mays., Chaudet MM, Naumann TA, Price NP, Rose DR, Protein Sci. 2014 Feb 6. doi: 10.1002/pro.2437. PMID: 24616181

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