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Since the adenovirus E2 promoter has been well characterized and is known to be regulated by transactivators encoded by many viruses , the activity of this promoter in specific cell types is discussed in reference to both the biology of the cell and the possible presence of as yet undetected viral gene products .
 protein: viral gene products; protein: transactivators; DNA: adenovirus E2 promoter
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 gene products; protein: transactivators; DNA: adenovirus E2 promoter