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Growing the polymer from the surface of chymotrypsin we were able to demonstrate that changes in temperature or pH can change predictably the conformation of the polymer surrounding the enzyme , which in turn enabled the rational tailoring of enzyme activity and stability .
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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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