8684
Our results show that Tax has at least two distinct activities on T cells , and suggest that Tax plays a crucial role in IL-2 -independent T-cell transformation induced by HTLV-1 , in addition to its well-known IL-2 -dependent cell transformation .
 ( cell type: T cells, None) , ( protein: IL-2, None) , ( protein: Tax, None) , ( protein: Tax, None) , ( protein: IL-2, 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: T cells, None) , ( protein: IL-2, None) , ( protein: Tax, None) , ( protein: Tax, None) , ( protein: IL-2, None) 