871
In electrophoretic mobility shift assays, NF kappa B binds to both conserved sites in the HIV-1 transcriptional enhancer and only to the single conserved site in the HIV-2 transcriptional enhancer .
 DNA: HIV-2 transcriptional enhancer; protein: NF kappa B; DNA: HIV-1 transcriptional enhancer
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:
 DNA: HIV-2 transcriptional enhancer; protein: NF kappa B; DNA: HIV-1 transcriptional enhancer