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Furthermore, the phosphorylated I kappa B alpha from calyculin A -treated cells , but not that from TNF-alpha -stimulated cells , is sensitive to PP-2A in vitro, suggesting the existence of fundamental differences in the phosphorylation of I kappa B alpha induced by the two different NF-kappa B inducers .
 TNF-alpha, I kappa B alpha, calyculin A -treated cells, phosphorylated I kappa B alpha, TNF-alpha -stimulated cells, I kappa B alpha, PP-2A, 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:
 TNF-alpha, I kappa B alpha, calyculin A -treated cells, phosphorylated I kappa B alpha, TNF-alpha -stimulated cells, I kappa B alpha, PP-2A, NF-kappa B