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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 .
 ER, monocytes, mRNA, estrogen receptor
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 ER, monocytes, mRNA, estrogen receptor