1BRB:
reference: Crystal structures of rat anionic trypsin complexed with the protein inhibitors APPI and BPTI., Perona JJ, Tsu CA, Craik CS, Fletterick RJ, J Mol Biol 1993 Apr 5;230(3):919-33. PMID: 7683059

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