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Our results provide the first evidence that both GATA-1 and C/EBPbeta synergistically transactivate the promoter of an eosinophil-specific granule protein gene and that FOG may act as a negative cofactor for the eosinophil lineage , unlike its positively regulatory function for the erythroid and megakaryocyte lineages .
 ( cell type: eosinophil lineage, None) , ( protein: FOG, None) , ( protein: C/EBPbeta, None) , ( DNA: eosinophil-specific granule protein gene, None) , ( protein: GATA-1, None) , ( DNA: promoter, 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: eosinophil lineage, None) , ( protein: FOG, None) , ( protein: C/EBPbeta, None) , ( DNA: eosinophil-specific granule protein gene, None) , ( protein: GATA-1, None) , ( DNA: promoter, None) 