8934
We provide a model of megakaryocytic differentiation in which expression of the alpha2 integrin gene requires signaling via the MAP kinase pathway to activate two tandem AP1 binding sites in the alpha2 integrin enhancer .
 ( DNA: AP1 binding sites, None) , ( DNA: alpha2 integrin gene, None) , ( protein: MAP kinase, None) , ( DNA: alpha2 integrin 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: AP1 binding sites, None) , ( DNA: alpha2 integrin gene, None) , ( protein: MAP kinase, None) , ( DNA: alpha2 integrin enhancer, None) 