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The corresponding region in the second AIDS retrovirus , HIV-2 , contains a conserved and a divergent NF kappa B binding site .
 protein: NF kappa B; DNA: NF kappa B binding site
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: NF kappa B; DNA: NF kappa B binding site