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CBF consists of two subunits, a DNA binding subunit , CBF alpha , and a second subunit, CBF beta , that stimulates the DNA binding activity of CBF alpha .
 ( protein: DNA binding subunit, None) , ( protein: CBF alpha, None) , ( protein: CBF beta, None) , ( protein: CBF alpha, None) , ( protein: CBF, 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: DNA binding subunit, None) , ( protein: CBF alpha, None) , ( protein: CBF beta, None) , ( protein: CBF alpha, None) , ( protein: CBF, None) 