130
Although further studies are required to determine the precise role of PEBP2 in the GM-CSF promoter activity , the present findings suggested the importance of the relative ratio of different PEBP2 isoforms in regulating the levels of the promoter activity .
 ( protein: PEBP2, None) , ( protein: PEBP2, None) , ( protein: GM-CSF, None) , ( protein: PEBP2 isoforms, 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: PEBP2, None) , ( protein: PEBP2, None) , ( protein: GM-CSF, None) , ( protein: PEBP2 isoforms, None) 