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The assayed biological activity also depended on the order of adding TNF - alpha and the plant extracts because the plant extracts could only block the NF - kappa B activation if added earlier but were unable to stop the signal when added after TNF - alpha .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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