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Cytokine profiles of peripheral blood mononuclear cells associated with chronic hepatitis B were analysed by RT-PCR .
 peripheral blood mononuclear cells, Cytokine profiles
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, Cytokine profiles