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The resistance of VchCA to bicarbonate inhibition may represent an evolutionary adaptation of this enzyme to living in an environment rich in this ion , such as the gastrointestinal tract , as bicarbonate is a virulence enhancer of this bacterium .
 Chemical: bicarbonate; Chemical: bicarbonate
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: bicarbonate; Chemical: bicarbonate