4868
The human T-cell leukemia virus -encoded tax protein is a potent activator of many viral and cellular genes transcribed by RNA polymerase II .
 ( protein: RNA polymerase II, None) , ( protein: human T-cell leukemia virus -encoded tax protein, None) , ( protein: tax protein, 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:
 ( protein: RNA polymerase II, None) , ( protein: human T-cell leukemia virus -encoded tax protein, None) , ( protein: tax protein, None) 