Human Caspase 9 Synthetic Peptide. Caspase 9 (ICE-like apoptotic protease 6, ICE LAP6, apoptotic protease Mch6, apoptotic protease activating factor 3, Apaf3) is a member of the peptidase family C14 that contains a CARD domain. Caspases are cysteine proteases, expressed as inactive precursors, that mediate apoptosis by proteolysis of specific substrates. Caspase 9 is active as a heterotetramer, is present in the cytosol and, upon activation, translocates to the mitochondria. Caspase 9 is involved in the caspase activation cascade responsible for apoptosis execution and cleaves/activates Caspase 3 and Caspase 6. Further, Caspase 9 is involved in the activation cascade of caspases responsible for apoptosis execution. Binding of caspase-9 to A