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Using recombinant HBxAg protein , we found HBxAg -specific stimulation of peripheral blood mononuclear cells in patients with acute hepatitis B virus infection (6 of 6) and chronic hepatitis B virus infection (6 of 17) but not in healthy individuals .
 protein: recombinant HBxAg protein; protein: HBxAg; protein: HBxAg; cell type: peripheral blood mononuclear cells
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:
 protein: recombinant HBxAg protein; protein: HBxAg; protein: HBxAg; cell type: peripheral blood mononuclear cells