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1. Administration of danazol for over one month reduced the levels of estrogen receptor ( ER ) and its mRNA to approximately 50 and 20%, respectively in monocytes .
 ( protein: ER, None) , ( cell type: monocytes, None) , ( RNA: mRNA, None) , ( protein: estrogen receptor, 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: ER, None) , ( cell type: monocytes, None) , ( RNA: mRNA, None) , ( protein: estrogen receptor, None) 