2400
The expression of COX isoforms in the duodenum is up - regulated by feeding , and inhibition of either COX - 1 or COX - 2 causes ulcers in the duodenum , suggesting that both isoforms play an important role in the protection of the duodenal mucosa .
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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:
 None