4823
Finally, we show that the B cell coactivator OBF-1/Bob1/OCA-B is only expressed in B cells and not in myeloid cells , and that OBF-1/Bob1/OCA-B can transactivate the PU.1 promoter in HeLa and myeloid cells .
 ( cell line: HeLa, None) , ( protein: OBF-1/Bob1/OCA-B, None) , ( protein: OBF-1/Bob1/OCA-B, None) , ( protein: PU.1, None) , ( DNA: PU.1 promoter, None) , ( cell type: B cells, None) , ( protein: coactivator, None) , ( cell type: myeloid cells, None) , ( cell type: myeloid 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:
 ( cell line: HeLa, None) , ( protein: OBF-1/Bob1/OCA-B, None) , ( protein: OBF-1/Bob1/OCA-B, None) , ( protein: PU.1, None) , ( DNA: PU.1 promoter, None) , ( cell type: B cells, None) , ( protein: coactivator, None) , ( cell type: myeloid cells, None) , ( cell type: myeloid cells, None) 