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One of NF-kappa B 's unique properties is its posttranslational activation via release of an inhibitory subunit , called inhibitor of NF-kappa B ( I kappa B ), from a sequestered cytoplasmic form .
 inhibitory subunit, NF-kappa B, inhibitor of NF-kappa B, sequestered cytoplasmic form, I 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:
 inhibitory subunit, NF-kappa B, inhibitor of NF-kappa B, sequestered cytoplasmic form, I kappa B