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A human T lymphoid cell line , PEER , dies by apoptosis in the presence of PMA and calcium ionophore .
 ( cell line: PEER, None) , ( cell line: human T lymphoid cell line, 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 line: PEER, None) , ( cell line: human T lymphoid cell line, None) 