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These experiments emphasize the role of NF-kappa B dimerization as a distinct level of transcriptional control that may permit functional diversification of a limited number of regulatory proteins .
 protein: regulatory proteins; protein: NF-kappa B
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: regulatory proteins; protein: NF-kappa B