1PBI:
reference: Dimeric crystal structure of a Bowman-Birk protease inhibitor from pea seeds., Li de la Sierra I, Quillien L, Flecker P, Gueguen J, Brunie S, J Mol Biol 1999 Jan 22;285(3):1195-207. PMID: 9887273

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