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NF - kappa B activation induces numerous proinflammatory gene products including cytokines , cyclooxygenase - 2 ( COX - 2 ) , and inducible nitric oxide synthase ( iNOS ) .
 nitric oxide
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 nitric oxide