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Activated NF-kappa B in nuclear extracts was measured by an electrophoretic mobility shift assay using 32P-labeled probe .
 32P-labeled probe, NF-kappa B
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 32P-labeled probe, NF-kappa B