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Gel retardation assays , using a 32P-probe containing the HIV-1 NF-kB probe and nuclear extracts from PMA -treated cells , showed significantly reduced induction of nuclear NF-kB binding proteins in these two subclones compared with wild type CEM and a control subclone.
 protein: NF-kB; protein: NF-kB; protein: nuclear NF-kB binding proteins; cell type: PMA -treated cells; protein: wild type CEM; protein: CEM
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-kB; protein: NF-kB; protein: nuclear NF-kB binding proteins; cell type: PMA -treated cells; protein: wild type CEM; protein: CEM