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In this study , we purified CA - II isoenzyme from sheep stomach with a 615 . 2 purification fold , 78 % purification yield and 5562 . 02 specific activity .
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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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