23600
The observed increase in temperature stability was explained in terms of a substantial increase in buried surface area relative to the wild - type HheC , together with enhanced interfacial interactions between the subunits that form the tetramer .
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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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