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An alpha - carbonic anhydrase ( CA , EC 4 . 2 . 1 . 1 ) has been recently cloned and characterized in the human pathogenic bacterium Vibrio cholerae , denominated VchCA ( Del Prete et al . J . Med . Chem . 2012 , 55 , 10742 ) .
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Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities:  
Answer:
 None