11654
eTh2 cells are the major source of IL-4 , while gamma interferon is produced by eTh1 cells .
 ( protein: gamma interferon, None) , ( cell type: eTh1 cells, None) , ( cell type: eTh2 cells, None) , ( protein: IL-4, 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: gamma interferon, None) , ( cell type: eTh1 cells, None) , ( cell type: eTh2 cells, None) , ( protein: IL-4, None) 