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Furthermore, the existence of estrogen receptor (estrogen binding activity) was examined histochemically in 39 cases and it was detected in 8.
 protein: estrogen receptor
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: estrogen receptor