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However, only a few CD8(+)-T-cell epitopes are known, with the majority being contained in the pp65 phosphoprotein , which is believed to dominate the CD8(+)-T-cell response to HCMV .
 pp65 phosphoprotein, CD8(+)-T-cell epitopes
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:
 pp65 phosphoprotein, CD8(+)-T-cell epitopes