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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 .
 ( protein: NF-kappa B, None) , ( cell line: U937, None) , ( cell line: monocyte line, None) , ( DNA: NF-kappa B elements, None) , ( cell line: T-cell lines, None) , ( protein: Tat, None) , ( DNA: HIV-1 LTR, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( protein: NF-kappa B, None) , ( cell line: U937, None) , ( cell line: monocyte line, None) , ( DNA: NF-kappa B elements, None) , ( cell line: T-cell lines, None) , ( protein: Tat, None) , ( DNA: HIV-1 LTR, None) 