9727
Using limiting-dilution analysis of peripheral blood mononuclear cells , a high RAKFKQLLQ -specific CTL precursor frequency was demonstrated after specific peptide or autologous lymphoblastoid cell line stimulation in both type A and type B EBV carriers .
 peripheral blood mononuclear cells
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:
 peripheral blood mononuclear cells