12410
The serine protease granzyme B is an essential component of the granule exocytosis pathway , a major apoptotic mechanism used by cytotoxic T lymphocytes and natural killer cells to induce target cell apoptosis .
 ( cell type: natural killer cells, None) , ( cell type: cytotoxic T lymphocytes, None) , ( protein: serine protease granzyme B, None) , ( cell type: lymphocytes, 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:
 ( cell type: natural killer cells, None) , ( cell type: cytotoxic T lymphocytes, None) , ( protein: serine protease granzyme B, None) , ( cell type: lymphocytes, None) 