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PEBP2 alpha A1 , alpha B1 , and alpha B2 proteins bound the PEBP2 site within the mouse GM-CSF promoter .
 ( protein: alpha B2 proteins, None) , ( protein: PEBP2, None) , ( protein: alpha B1, None) , ( protein: PEBP2, None) , ( protein: alpha A1, None) , ( DNA: PEBP2 site, None) , ( protein: PEBP2 alpha A1, None) , ( DNA: mouse GM-CSF promoter, None) , ( protein: GM-CSF, 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: alpha B2 proteins, None) , ( protein: PEBP2, None) , ( protein: alpha B1, None) , ( protein: PEBP2, None) , ( protein: alpha A1, None) , ( DNA: PEBP2 site, None) , ( protein: PEBP2 alpha A1, None) , ( DNA: mouse GM-CSF promoter, None) , ( protein: GM-CSF, None) 