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We found that the retinoblastoma susceptibility gene product ( Rb ) dramatically suppressed this IE2 transactivation of various promoters .
 various promoters, retinoblastoma susceptibility gene product, IE2, Rb
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:
 various promoters, retinoblastoma susceptibility gene product, IE2, Rb