1SH7:
reference: Crystal structure of a subtilisin-like serine proteinase from a psychrotrophic Vibrio species reveals structural aspects of cold adaptation., Arnorsdottir J, Kristjansson MM, Ficner R, FEBS J 2005 Feb;272(3):832-45. PMID: 15670163

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