1026
Mutation of the AP1 motif in the context of the intron enhancer was shown to decrease enhancer-mediated activation of the promoter in both pre-B cells induced with LPS and constitutive expression in mature B cells .
 ( DNA: intron enhancer, None) , ( DNA: AP1 motif, None) , ( cell type: pre-B cells, None) , ( cell type: mature B cells, 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: intron enhancer, None) , ( DNA: AP1 motif, None) , ( cell type: pre-B cells, None) , ( cell type: mature B cells, None) 