1791
However, within the B-cell lineage , ERP is highly expressed primarily at early stages of B-lymphocyte development , and expression declines drastically upon B-cell maturation , correlating with the enhancer activity of the IgH pi site .
 ( DNA: IgH pi site, None) , ( cell type: B-lymphocyte, None) , ( protein: ERP, None) , ( cell type: B-cell lineage, 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: IgH pi site, None) , ( cell type: B-lymphocyte, None) , ( protein: ERP, None) , ( cell type: B-cell lineage, None) 