2227
However, for each time examined, the expression of NF-kappa B was maximum after the 0.5-Gy exposure .
 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