5487
HTLV-I encodes a potent transactivator protein termed Tax that appears to play an important role in the process of T-cell immortalization .
 ( protein: transactivator, None) , ( protein: Tax, 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: transactivator, None) , ( protein: Tax, None) 