. "Any process that initiates the activity of the inactive enzyme cysteine-type endopeptidase in the context of an apoptotic process and is mediated by cytochrome c." . . "activation of cysteine-type endopeptidase activity involved in apoptotic process by cytochrome c" . "activation of caspase activity by cytochrome c" . "caspase activation via cytochrome c" . . .