4129
Precise alignment of sites required for mu enhancer activation in B cells .
 ( DNA: alignment of sites, None) , ( cell type: B cells, None) , ( DNA: mu enhancer, 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: alignment of sites, None) , ( cell type: B cells, None) , ( DNA: mu enhancer, None) 