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NF-IL6 is an important transcriptional regulator of genes induced in activated monocytes/ macrophages , and NF-IL6 is the only CCAAT/enhancer-binding protein (C/EBP) family member whose steady-state mRNA levels increase upon activation of monocytes (1).
 ( protein: NF-IL6, None) , ( cell type: monocytes, None) , ( protein: CCAAT/enhancer-binding protein (C/EBP) family, None) , ( protein: NF-IL6, None) , ( cell type: macrophages, None) , ( cell type: activated monocytes/ macrophages, 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: NF-IL6, None) , ( cell type: monocytes, None) , ( protein: CCAAT/enhancer-binding protein (C/EBP) family, None) , ( protein: NF-IL6, None) , ( cell type: macrophages, None) , ( cell type: activated monocytes/ macrophages, None) 