4900
Newly translated STAT1 binds in equilibrium fashion to STAT2 and STAT3 , but we show that STAT2 and STAT3 exist in separate heterocomplexes with STAT1 , consistent with a model in which STAT1 contains a common binding site for other STAT proteins .
 ( protein: STAT2, None) , ( protein: STAT3, None) , ( protein: STAT1, None) , ( protein: heterocomplexes, None) , ( protein: STAT1, None) , ( protein: STAT1, None) , ( protein: STAT2, None) , ( protein: STAT3, None) , ( protein: STAT proteins, 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: STAT2, None) , ( protein: STAT3, None) , ( protein: STAT1, None) , ( protein: heterocomplexes, None) , ( protein: STAT1, None) , ( protein: STAT1, None) , ( protein: STAT2, None) , ( protein: STAT3, None) , ( protein: STAT proteins, None) 