1QGI:
reference: Crystal structure of chitosanase from Bacillus circulans MH-K1 at 1.6-A resolution and its substrate recognition mechanism., Saito J, Kita A, Higuchi Y, Nagata Y, Ando A, Miki K, J Biol Chem 1999 Oct 22;274(43):30818-25. PMID: 10521473

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