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Mapping of B-cell epitopes of the human hepatitis B virus X protein .
 protein: human hepatitis B virus X protein; protein: B-cell epitopes
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: human hepatitis B virus X protein; protein: B-cell epitopes