6640
DNA fragmentation was efficiently blocked by the caspase inhibitor Z-VAD-fmk and partially blocked by Ac-DEVD-fmk , suggesting that SN50 -mediated apoptosis is caspase -dependent .
 ( protein: caspase, None) , ( protein: caspase inhibitor, None) , ( protein: Z-VAD-fmk, None) , ( protein: Ac-DEVD-fmk, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: caspase, None) , ( protein: caspase inhibitor, None) , ( protein: Z-VAD-fmk, None) , ( protein: Ac-DEVD-fmk, None) 