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To address potential mechanisms by which estrogens suppress erythropoiesis , we have examined their effects on GATA-1 , an erythroid transcription factor that participates in the regulation of the majority of erythroid cell-specific genes and is necessary for full maturation of erythrocytes .
 ( cell type: erythrocytes, None) , ( protein: erythroid transcription factor, None) , ( protein: GATA-1, None) , ( DNA: erythroid cell-specific genes, 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:
 ( cell type: erythrocytes, None) , ( protein: erythroid transcription factor, None) , ( protein: GATA-1, None) , ( DNA: erythroid cell-specific genes, None) 