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In addition, Tax also stimulates the transcription of the E2F-1 gene itself.
 E2F-1, Tax, E2F-1 gene
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:
 E2F-1, Tax, E2F-1 gene