4491
STAT5A -STAT5A homodimers and STAT5A -STAT5B heterodimers formed in response to GM-CSF .
 ( protein: STAT5A, None) , ( protein: STAT5A -STAT5A homodimers, None) , ( protein: STAT5A, None) , ( protein: GM-CSF, None) , ( protein: -STAT5B, None) , ( protein: STAT5A -STAT5B heterodimers, None) , ( protein: -STAT5A, 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: STAT5A, None) , ( protein: STAT5A -STAT5A homodimers, None) , ( protein: STAT5A, None) , ( protein: GM-CSF, None) , ( protein: -STAT5B, None) , ( protein: STAT5A -STAT5B heterodimers, None) , ( protein: -STAT5A, None) 