6639
Inhibition of NF-kappa B resulted in the externalization of phosphatidylserine , induction of DNA breaks, and morphological changes consistent with apoptosis .
 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:
 NF-kappa B