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Deletion of the NF-kappa B elements of the HIV-1 LTR significantly inhibited Tat -mediated transactivation in T-cell lines , as well as in a monocyte line , U937 .
 NF-kappa B, U937, monocyte line, NF-kappa B elements, T-cell lines, Tat, HIV-1 LTR
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:
 NF-kappa B, U937, monocyte line, NF-kappa B elements, T-cell lines, Tat, HIV-1 LTR