6672
Two of these regions, BR3 and BR4 located at positions -102 to -73, have not previously been described as regulators of IL-5 expression in T cells .
 ( cell type: T cells, None) , ( protein: IL-5, None) , ( DNA: BR4, None) , ( DNA: BR3, 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:
 ( cell type: T cells, None) , ( protein: IL-5, None) , ( DNA: BR4, None) , ( DNA: BR3, None) 