3PD1:
reference: Thermodynamic, enzymatic and structural effects of removing a salt bridge at the base of loop 4 in (pro)caspase-3., Walters J, Swartz P, Mattos C, Clark AC, Arch Biochem Biophys. 2011 Jan 23. PMID: 21266160

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