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We found that the retinoblastoma susceptibility gene product ( Rb ) dramatically suppressed this IE2 transactivation of various promoters .
 ( DNA: various promoters, None) , ( protein: retinoblastoma susceptibility gene product, None) , ( protein: IE2, None) , ( protein: Rb, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( DNA: various promoters, None) , ( protein: retinoblastoma susceptibility gene product, None) , ( protein: IE2, None) , ( protein: Rb, None) 