8PTI:
reference: Crystal structure of a Y35G mutant of bovine pancreatic trypsin inhibitor., Housset D, Kim KS, Fuchs J, Woodward C, Wlodawer A, J Mol Biol 1991 Aug 5;220(3):757-70. PMID: 1714504

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