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Carbonic anhydrase ( EC 4 . 2 . 1 . 1 . , CA ) is a pH regulatory / metabolic enzyme in all life kingdoms , being found in organisms all over the phylogenetic tree .
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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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