1TX6:
reference: Crystal structure of the Bowman-Birk inhibitor from barley seeds in ternary complex with porcine trypsin., Park EY, Kim JA, Kim HW, Kim YS, Song HK, J Mol Biol 2004 Oct 8;343(1):173-86. PMID: 15381428

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