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Mapping experiments indicate that GATA-1 and the ER form at least two contacts, which involve the finger region and the N-terminal activation domain of GATA-1 .
 ( protein: ER, None) , ( protein: GATA-1, None) , ( protein: N-terminal activation domain, 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: ER, None) , ( protein: GATA-1, None) , ( protein: N-terminal activation domain, None) , ( protein: GATA-1, None) 