4820
Here we show that the murine PU.1 promoter is also specifically and highly functional in B cell lines as well.
 ( cell line: B cell lines, None) , ( DNA: murine PU.1 promoter, None) , ( protein: PU.1, None) , ( DNA: PU.1 promoter, 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: B cell lines, None) , ( DNA: murine PU.1 promoter, None) , ( protein: PU.1, None) , ( DNA: PU.1 promoter, None) 