1019
N-acetyl-L-cysteine ( NAC ), a well characterized antioxidant which counteracts the effects of reactive oxygen intermediates ( ROI ) in living cells, prevented the activation of NF-kappa B by H2O2 .
 protein: NF-kappa B
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 protein: NF-kappa B