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Previously, transcription of the c-fos gene has been reported to be transactivated by the viral transcription factor , Tax1 .
 protein: viral transcription factor; DNA: c-fos gene; protein: Tax1
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: viral transcription factor; DNA: c-fos gene; protein: Tax1