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The Tat protein of human immunodeficiency virus type 1 ( HIV-1 ) is essential for productive infection and is a potential target for antiviral therapy .
 protein: Tat protein
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: Tat protein