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Productive infection of T cells with human immunodeficiency virus 1 ( HIV-1 ) typically requires that the T cells be stimulated with antigens or mitogens .
 cell type: T cells; cell type: T cells
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:
 cell type: T cells; cell type: T cells