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Core binding factor ( CBF ), also known as polyomavirus enhancer-binding protein 2 and SL3 enhancer factor 1 , is a mammalian transcription factor that binds to an element termed the core within the enhancers of the murine leukemia virus family of retroviruses .
 ( DNA: enhancers, None) , ( protein: Core binding factor, None) , ( protein: SL3 enhancer factor 1, None) , ( protein: CBF, None) , ( protein: polyomavirus enhancer-binding protein 2, None) , ( protein: mammalian transcription factor, 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: enhancers, None) , ( protein: Core binding factor, None) , ( protein: SL3 enhancer factor 1, None) , ( protein: CBF, None) , ( protein: polyomavirus enhancer-binding protein 2, None) , ( protein: mammalian transcription factor, None) 