4EHF:
reference: Allosteric Modulation of Caspase-3 through Mutagenesis., Walters J, Schipper JL, Swartz P, Mattos C, Clark AC, Biosci Rep. 2012 May 18. PMID: 22607239

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