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The carboxy-terminal half of the HBx protein was preferentially recognized by antibodies from patients with chronic hepatitis and contained a short immunodominant antigenic region with at least two major nonoverlapping epitopes .
 protein: carboxy-terminal half; protein: HBx protein; protein: immunodominant antigenic region; protein: nonoverlapping epitopes; protein: antibodies; protein: HBx
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: carboxy-terminal half; protein: HBx protein; protein: immunodominant antigenic region; protein: nonoverlapping epitopes; protein: antibodies; protein: HBx