2AB9:
reference: Discovery, structural determination, and putative processing of the precursor protein that produces the cyclic trypsin inhibitor sunflower trypsin inhibitor 1., Mulvenna JP, Foley FM, Craik DJ, J Biol Chem 2005 Sep 16;280(37):32245-53. Epub 2005 Jul 21. PMID: 16036912

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