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Target structures of the CD8(+)-T-cell response to human cytomegalovirus : the 72-kilodalton major immediate-early protein revisited.
 72-kilodalton major immediate-early protein
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:
 72-kilodalton major immediate-early protein