1UHB:
reference: Trypsin activity reduced by an autocatalytically produced nonapeptide., Ibrahim BS, Shamaladevi N, Pattabhi V, J Biomol Struct Dyn 2004 Jun;21(6):737-44. PMID: 15106996

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