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HIV-1 proviral DNA contains two binding sites for the transcription factor NF-kappa B .
 DNA: HIV-1 proviral DNA; DNA: binding sites; protein: NF-kappa B; protein: transcription factor
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-1 proviral DNA; DNA: binding sites; protein: NF-kappa B; protein: transcription factor