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To get further insights into the molecular mechanisms underlying the biological activity of Tat , we investigated the effect of endogenous and exogenous Tat protein on c-fos gene expression in T lymphoblastoid (Jurkat) and monocytic (U937) cell lines , as well as in primary peripheral blood mononuclear cells ( PBMC ).
 Tat, primary peripheral blood mononuclear cells, Tat protein, PBMC
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:
 Tat, primary peripheral blood mononuclear cells, Tat protein, PBMC