4283
On the basis of several independent assays , we now report a physical and functional interaction between Tax and the transcription factor , TFIIA .
 ( protein: Tax, None) , ( protein: TFIIA, None) , ( protein: transcription factor, 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: Tax, None) , ( protein: TFIIA, None) , ( protein: transcription factor, None) 