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Activation of NF-kappa B by various cellular stimuli involves the phosphorylation and subsequent degradation of its inhibitor, I kappa B alpha , although the underlying mechanism remains unclear.
 NF-kappa B, I kappa B alpha
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:
 NF-kappa B, I kappa B alpha