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To understand the molecular bases for cytokine redundancy and pleiotropy , we have compared the Stat proteins activated in peripheral blood lymphocytes ( PBLs ) by cytokines with shared and distinct actions.
 ( cell type: peripheral blood lymphocytes, None) , ( cell type: PBLs, None) , ( protein: cytokines, None) , ( protein: Stat proteins, 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: peripheral blood lymphocytes, None) , ( cell type: PBLs, None) , ( protein: cytokines, None) , ( protein: Stat proteins, None) 