14643
A lymphoid-specific element , microB , is necessary for enhancer function in pre-B cells .
 ( cell type: pre-B cells, None) , ( DNA: lymphoid-specific element, None) , ( DNA: microB, None) , ( DNA: 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:
 ( cell type: pre-B cells, None) , ( DNA: lymphoid-specific element, None) , ( DNA: microB, None) , ( DNA: enhancer, None) 