1CHO:
reference: Crystal and molecular structures of the complex of alpha-chymotrypsin with its inhibitor turkey ovomucoid third domain at 1.8 A resolution., Fujinaga M, Sielecki AR, Read RJ, Ardelt W, Laskowski M Jr, James MN, J Mol Biol 1987 May 20;195(2):397-418. PMID: 3477645

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