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This activation is mediated by the host transcription factor NF-kappa B [G.Nabel and D.Baltimore, Nature (London) 326:711-717, 1987].
 protein: NF-kappa B; protein: host 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:
 protein: NF-kappa B; protein: host transcription factor