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On the basis of several independent assays , we now report a physical and functional interaction between Tax and the transcription factor , TFIIA .
 Tax, TFIIA, transcription factor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 Tax, TFIIA, transcription factor