1BZX:
reference: The crystal structure of anionic salmon trypsin in complex with bovine pancreatic trypsin inhibitor., Helland R, Leiros I, Berglund GI, Willassen NP, Smalas AO, Eur J Biochem 1998 Sep 1;256(2):317-24. PMID: 9760170

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