11855
By competition experiments and supershift assays , we identified the induced HRF as containing at least the ubiquitous transcription factor NF-Y .
 ( protein: transcription factor, None) , ( protein: NF-Y, None) , ( protein: HRF, 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: transcription factor, None) , ( protein: NF-Y, None) , ( protein: HRF, None) 