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It is tempting to speculate that enhanced NF-kappa B expression caused by free radical production/oxidative stress may modulate liver injury , perhaps through an effect on cytotoxic cytokine synthesis .
 protein: NF-kappa B; protein: cytotoxic cytokine
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; protein: cytotoxic cytokine