1IB9:
reference: Circular proteins in plants: solution structure of a novel macrocyclic trypsin inhibitor from Momordica cochinchinensis., Felizmenio-Quimio ME, Daly NL, Craik DJ, J Biol Chem 2001 Jun 22;276(25):22875-82. PMID: 11292835

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