1M72:
reference: Crystal structure of an invertebrate caspase., Forsyth CM, Lemongello D, LaCount DJ, Friesen PD, Fisher AJ, J Biol Chem 2004 Feb 20;279(8):7001-8. Epub 2003 Nov 27. PMID: 14645217

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