6750
IL-4 conducts its biological activities through binding to the IL-4 receptor ( IL-4R ) on the surface of target cells .
 ( protein: IL-4R, None) , ( protein: IL-4, None) , ( protein: IL-4 receptor, None) , ( protein: IL-4, None) , ( cell type: target cells, 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-4R, None) , ( protein: IL-4, None) , ( protein: IL-4 receptor, None) , ( protein: IL-4, None) , ( cell type: target cells, None) 