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Responsiveness of LTR constructs deleted of kappa B elements to HIV Tat expression was increased upon OKA but not TNF stimulation .
 ( DNA: LTR constructs, None) , ( protein: HIV Tat, None) , ( protein: TNF, None) , ( DNA: kappa B elements, 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:
 ( DNA: LTR constructs, None) , ( protein: HIV Tat, None) , ( protein: TNF, None) , ( DNA: kappa B elements, None) 