8714
Allergen-specific T cells in atopic patients are polarized IL-4-producing Th2 cells , promoting IgE synthesis by B cells .
 ( protein: IgE, None) , ( cell line: IL-4-producing Th2 cells, None) , ( cell type: T cells, None) , ( cell type: B 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: IgE, None) , ( cell line: IL-4-producing Th2 cells, None) , ( cell type: T cells, None) , ( cell type: B cells, None) 