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In this paper, the expression of this gene in blood cells was first investigated in fractions of nucleated cells , revealing predominant expression of the Ah receptor gene in the monocyte fraction .
 ( protein: Ah receptor, None) , ( cell type: nucleated cells, None) , ( DNA: Ah receptor gene, None) , ( cell type: blood cells, None) , ( cell type: monocyte fraction, 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: Ah receptor, None) , ( cell type: nucleated cells, None) , ( DNA: Ah receptor gene, None) , ( cell type: blood cells, None) , ( cell type: monocyte fraction, None) 