13621
Tax corresponds to a 40-kDa transforming protein from the pathogenic retrovirus human T-cell leukemia virus type 1 ( HTLV-1 ) that activates nuclear expression of the NF-kappaB /Rel family of transcription factors by an unknown mechanism .
 ( protein: 40-kDa transforming protein, None) , ( protein: NF-kappaB, None) , ( protein: NF-kappaB /Rel family, None) , ( protein: Tax, None) , ( protein: transcription factors, 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: 40-kDa transforming protein, None) , ( protein: NF-kappaB, None) , ( protein: NF-kappaB /Rel family, None) , ( protein: Tax, None) , ( protein: transcription factors, None) 