9731
Expression studies as well as the use of transgenic animals have demonstrated that the A-MYB transcription factor plays central and specific role in the regulation of mature B cell proliferation and/or differentiation .
 ( cell type: mature B cell, None) , ( protein: transcription factor, None) , ( protein: A-MYB, 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: mature B cell, None) , ( protein: transcription factor, None) , ( protein: A-MYB, None) 