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In contrast to the purely enhancer-dependent effect of cytokines such as TNF on the activity of the HIV regulatory region ( LTR ), we observed that okadaic acid ( OKA ) activates HIV transcription through both the enhancer, responding to the factor NF-kappa B , and the promoter domain of the LTR .
 LTR, HIV regulatory region, NF-kappa B, cytokines, LTR, promoter domain, TNF
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:
 LTR, HIV regulatory region, NF-kappa B, cytokines, LTR, promoter domain, TNF