1SCD:
reference: X-ray crystal structure of cross-linked subtilisin Carlsberg in water vs. acetonitrile., Fitzpatrick PA, Ringe D, Klibanov AM, Biochem Biophys Res Commun 1994 Jan 28;198(2):675-81. PMID: 8297378

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