621
However, this deletion mutation prevented the induced phosphorylation , degradative loss , and functional release of I kappa B alpha from NF-kappa B in Tax -expressing cells .
 I kappa B alpha, NF-kappa B, Tax -expressing cells, Tax
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, NF-kappa B, Tax -expressing cells, Tax