1MTN:
reference: Crystal structure of the bovine alpha-chymotrypsin:Kunitz inhibitor complex. An example of multiple protein:protein recognition sites., Capasso C, Rizzi M, Menegatti E, Ascenzi P, Bolognesi M, J Mol Recognit 1997 Jan-Feb;10(1):26-35. PMID: 9179777

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