1V6D:
reference: Secondary binding site of trypsin: revealed by crystal structure of trypsin-Peptide complex., Shamaladevi N, Pattabhi V, J Biomol Struct Dyn 2005 Jun;22(6):635-42. PMID: 15842169

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