1506
In monocytes , the nuclear factor NF-kappa B has been invoked as an important transcription factor in the expression of cytokine genes , of cell-surface receptors and in the expression of human immunodeficiency virus .
 ( protein: nuclear factor NF-kappa B, None) , ( cell type: monocytes, None) , ( DNA: cytokine genes, None) , ( protein: NF-kappa B, None) , ( protein: transcription factor, None) , ( protein: cell-surface receptors, 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: nuclear factor NF-kappa B, None) , ( cell type: monocytes, None) , ( DNA: cytokine genes, None) , ( protein: NF-kappa B, None) , ( protein: transcription factor, None) , ( protein: cell-surface receptors, None) 