2601
The expression of the progesterone receptor in human peripheral blood lymphocytes was analysed, using an enzyme linked immunosorbent assay ( Abbott PgR-EIA monoclonal ), in order to evaluate its prognostic character in the context of spontaneous abortion .
 progesterone receptor, human peripheral blood lymphocytes, peripheral blood lymphocytes
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 progesterone receptor, human peripheral blood lymphocytes, peripheral blood lymphocytes