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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; cell type: monocytes; RNA: mRNA; protein: estrogen receptor
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
 Entities: ER, monocytes, mRNA, estrogen receptor 
Answer:
 protein: ER; cell type: monocytes; RNA: mRNA; protein: estrogen receptor