1CL1:
reference: Crystal structure of the pyridoxal-5'-phosphate dependent cystathionine beta-lyase from Escherichia coli at 1.83 A., Clausen T, Huber R, Laber B, Pohlenz HD, Messerschmidt A, J Mol Biol 1996 Sep 20;262(2):202-24. PMID: 8831789

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