12877
Cytokines , IL-2 , IL-4 , IL-6 , IL-7 , IL-12 , and IL-15 are key regulators of human peripheral blood T and NK cell activation and differentiation but the precise mechanisms that give rise to their differential activities within these cells are not clear.
 ( protein: Cytokines, None) , ( protein: IL-4, None) , ( protein: IL-12, None) , ( protein: IL-7, None) , ( protein: IL-15, None) , ( protein: IL-6, None) , ( protein: IL-2, 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: Cytokines, None) , ( protein: IL-4, None) , ( protein: IL-12, None) , ( protein: IL-7, None) , ( protein: IL-15, None) , ( protein: IL-6, None) , ( protein: IL-2, None) 