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We have used a 32P-labeled oligonucleotide derived from human immunodeficiency virus ( HIV-1 ) long terminal repeat , which contains a tandem repeat of the NF kappa B binding sequence , as a probe in a gel retardation assay to study this transcription factor .
 protein: transcription factor; DNA: human immunodeficiency virus ( HIV-1 ) long terminal repeat; protein: NF kappa B; DNA: tandem repeat; DNA: NF kappa B binding sequence
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: transcription factor; DNA: human immunodeficiency virus ( HIV-1 ) long terminal repeat; protein: NF kappa B; DNA: tandem repeat; DNA: NF kappa B binding sequence