13491
This implies that high levels of IgE in these patients either results from B cells that have already undergone class switching , from Ig class switching that is localized to target tissues , or both.
 ( protein: IgE, 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 type: B cells, None) 