2977
The intracellular events that lead to the inactivation of I kappa B , i.e. the activation of NF-kappa B , are complex.
 NF-kappa B, 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:
 NF-kappa B, I kappa B