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Activation of NF-kappa B by phosphatase inhibitors involves the phosphorylation of I kappa B alpha at phosphatase 2A-sensitive sites .
 I kappa B alpha, phosphatase, phosphatase 2A-sensitive sites, 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:
 I kappa B alpha, phosphatase, phosphatase 2A-sensitive sites, NF-kappa B