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The role of shared receptor motifs and common Stat proteins in the generation of cytokine pleiotropy and redundancy by IL-2 , IL-4 , IL-7 , IL-13 , and IL-15 .
 ( protein: IL-4, None) , ( protein: common Stat proteins, None) , ( protein: IL-2, None) , ( protein: cytokine, None) , ( protein: IL-13, None) , ( protein: shared receptor motifs, None) , ( protein: IL-15, None) , ( protein: IL-7, 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: IL-4, None) , ( protein: common Stat proteins, None) , ( protein: IL-2, None) , ( protein: cytokine, None) , ( protein: IL-13, None) , ( protein: shared receptor motifs, None) , ( protein: IL-15, None) , ( protein: IL-7, None) 