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Each serum contained antibodies to a different set of epitopes , which taken together cover most of the HBx sequence .
 protein: HBx sequence; protein: epitopes; protein: antibodies
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: HBx sequence; protein: epitopes; protein: antibodies