1550
[Changes in leucocytic estrogen receptor levels in patients with climacteric syndrome and therapeutic effect of liuwei dihuang pills ]
 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