6119
In our previous study, we demonstrated a major positive regulatory role for GATA-1 and a negative regulatory role for GATA-2 in MBP gene transcription .
 ( protein: GATA-2, None) , ( protein: MBP, None) , ( protein: GATA-1, 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: GATA-2, None) , ( protein: MBP, None) , ( protein: GATA-1, None) 