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ER -mediated repression of GATA-1 activity occurs on an artificial promoter containing a single GATA-binding site , as well as in the context of an intact promoter which is normally regulated by GATA-1 .
 ( DNA: artificial promoter, None) , ( protein: GATA-1, None) , ( DNA: intact promoter, None) , ( DNA: GATA-binding site, None) , ( protein: ER, 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:
 ( DNA: artificial promoter, None) , ( protein: GATA-1, None) , ( DNA: intact promoter, None) , ( DNA: GATA-binding site, None) , ( protein: ER, None) , ( protein: GATA-1, None) 