4706
Virtually all B-cell lines , with the exception of some myeloma cell lines , are positive for BSAP , which is the transcription factor for promoters for several B-cell markers , including VpreB1 , lambda 5 , CD19 , and CD20 .
 ( cell line: myeloma cell lines, None) , ( DNA: promoters, None) , ( cell line: B-cell lines, None) , ( protein: CD20, None) , ( protein: transcription factor, None) , ( protein: B-cell markers, None) , ( protein: BSAP, None) , ( protein: lambda 5, None) , ( protein: CD19, None) , ( protein: VpreB1, 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: myeloma cell lines, None) , ( DNA: promoters, None) , ( cell line: B-cell lines, None) , ( protein: CD20, None) , ( protein: transcription factor, None) , ( protein: B-cell markers, None) , ( protein: BSAP, None) , ( protein: lambda 5, None) , ( protein: CD19, None) , ( protein: VpreB1, None) 