14658
To elucidate the roles of individual GATA factors in erythropoiesis , conditional alleles of GATA-1 , GATA-2 , and GATA-3 were prepared by fusing each of the factors to the hormone-binding domain of the human estrogen receptor ( ER ).
 ( protein: GATA-1, None) , ( protein: GATA factors, None) , ( protein: GATA-2, None) , ( protein: human estrogen receptor, None) , ( protein: hormone-binding domain, None) , ( protein: ER, None) , ( protein: GATA-3, 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: GATA-1, None) , ( protein: GATA factors, None) , ( protein: GATA-2, None) , ( protein: human estrogen receptor, None) , ( protein: hormone-binding domain, None) , ( protein: ER, None) , ( protein: GATA-3, None) 