1597
The number of estrogen receptor ( ER ) in human peripheral leucocytes in 13 men with gynecomastia were measured by radioligand binding method. The results were compared with those of 13 sex-and age-matched healthy subjects .
 cell type: human peripheral leucocytes; protein: ER; 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:
 cell type: human peripheral leucocytes; protein: ER; protein: estrogen receptor