4J2Y:
reference: Crystal Structures of a Plant Trypsin Inhibitor from Enterolobium contortisiliquum (EcTI) and of Its Complex with Bovine Trypsin., Zhou D, Lobo YA, Batista IF, Marques-Porto R, Gustchina A, Oliva ML, Wlodawer A, PLoS One. 2013 Apr 23;8(4):e62252. doi: 10.1371/journal.pone.0062252. Print 2013. PMID: 23626794

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