12541
In sharp contrast, in B cells treated with the phorbol ester 12-O-tetradecanoylphorbol-13-acetate ( TPA ), strong interactions between the X2 box and NF-X2 containing c-Fos were observed.
 ( DNA: NF-X2, None) , ( cell type: B cells, None) , ( DNA: X2 box, None) , ( protein: c-Fos, 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:
 ( DNA: NF-X2, None) , ( cell type: B cells, None) , ( DNA: X2 box, None) , ( protein: c-Fos, None) 