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In addition, treatment of these nuclear extracts with sodium deoxycholate restored their ability to form the heterodimer , suggesting the presence of an inhibitor of NF-kappa B activity .
 protein: NF-kappa B; protein: heterodimer
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: heterodimer