4330
Stepwise deletions into the proximal promoter also revealed that the CBF site, but not the YY-1 site , was required for efficient induction of transcriptional activation .
 ( protein: CBF, None) , ( DNA: YY-1 site, None) , ( DNA: proximal promoter, 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: CBF, None) , ( DNA: YY-1 site, None) , ( DNA: proximal promoter, None) 