4221
Supershifts with anti-STAT antibodies identified these as STAT1 and STAT5 complexes .
 ( DNA: anti-STAT antibodies, None) , ( protein: STAT5, None) , ( protein: STAT5 complexes, None) , ( protein: STAT1, 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:
 ( DNA: anti-STAT antibodies, None) , ( protein: STAT5, None) , ( protein: STAT5 complexes, None) , ( protein: STAT1, None) 