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The present work has studied mechanisms responsible for induction of early growth response 1 (EGR-1) gene expression during monocytic differentiation of U-937 myeloid leukemia cells .
 ( cell line: U-937 myeloid leukemia cells, None) , ( DNA: early growth response 1 (EGR-1) gene, 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 line: U-937 myeloid leukemia cells, None) , ( DNA: early growth response 1 (EGR-1) gene, None) 