13262
Indeed, when Tax is coexpressed with the E2F-1 transcription factor in CEM T-cells , which lack expression of p16(INK4A) , it strongly potentiates the E2F -dependent activation of a reporter construct driven by a promoter containing E2F binding sites .
 ( DNA: E2F binding sites, None) , ( cell line: CEM T-cells, None) , ( protein: E2F-1, None) , ( protein: Tax, None) , ( protein: E2F, None) , ( protein: transcription factor, None) , ( protein: p16(INK4A), None) , ( protein: E2F, 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: E2F binding sites, None) , ( cell line: CEM T-cells, None) , ( protein: E2F-1, None) , ( protein: Tax, None) , ( protein: E2F, None) , ( protein: transcription factor, None) , ( protein: p16(INK4A), None) , ( protein: E2F, None) 