7081
These results indicate that activation of the CREB/ATF pathway by Tax is dispensable for the immortalization of T cells by HTLV-1 , whereas activation of the NF-kappaB pathway may be critical.
 ( protein: CREB/ATF, None) , ( protein: NF-kappaB, None) , ( cell type: T cells, 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: CREB/ATF, None) , ( protein: NF-kappaB, None) , ( cell type: T cells, None) , ( protein: Tax, None) 