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IL-7 and IL-15 induced the same complexes as IL-2 , a feature explained by the existence of similar tyrosine -phosphorylated motifs in the cytoplasmic domains of IL-2R beta and IL-7R that can serve as docking sites for Stat proteins .
 ( protein: Stat proteins, None) , ( protein: cytoplasmic domains, None) , ( protein: IL-2, None) , ( protein: IL-15, None) , ( protein: IL-2R beta, None) , ( protein: tyrosine -phosphorylated motifs, None) , ( protein: IL-7R, 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: Stat proteins, None) , ( protein: cytoplasmic domains, None) , ( protein: IL-2, None) , ( protein: IL-15, None) , ( protein: IL-2R beta, None) , ( protein: tyrosine -phosphorylated motifs, None) , ( protein: IL-7R, None) , ( protein: IL-7, None) 