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