12538
We investigated the function of the evolutionary conserved X2 box in the promoter of the HLA-DRA gene from the human major histocompatibility complex ( MHC ) in resting and activated B cells .
 ( cell type: B cells, None) , ( DNA: HLA-DRA gene, None) , ( DNA: promoter, None) , ( DNA: X2 box, None) , ( protein: MHC, None) , ( protein: human major histocompatibility complex, 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: B cells, None) , ( DNA: HLA-DRA gene, None) , ( DNA: promoter, None) , ( DNA: X2 box, None) , ( protein: MHC, None) , ( protein: human major histocompatibility complex, None) 