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Tat , a potent activator of HIV-1 gene expression , serves to greatly increase the rate of transcription directed by the viral promoter .
 DNA: viral promoter; protein: Tat
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:
 DNA: viral promoter; protein: Tat