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The tax gene product of human T-cell leukemia virus type I ( HTLV-I ) is a potent transcriptional activator that both stimulates viral gene expression and activates an array of cellular genes involved in T-cell growth .
 ( protein: transcriptional activator, None) , ( cell type: T-cell, None) , ( DNA: cellular genes, 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:
 ( protein: transcriptional activator, None) , ( cell type: T-cell, None) , ( DNA: cellular genes, None) 