5223
Thus, CIITA not only activates the expression of class II genes but recruits another B cell-specific coactivator to increase transcriptional activity of class II promoters in B cells .
 ( protein: CIITA, None) , ( DNA: class II promoters, None) , ( cell type: B cells, None) , ( DNA: class II genes, 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: CIITA, None) , ( DNA: class II promoters, None) , ( cell type: B cells, None) , ( DNA: class II genes, None) 