26142
Although the dissociation constants for both the linear and plasmid - based operator are in the range of 4 nM , the association and dissociation rates of Lac repressor binding to the plasmid - based operator are ~ 18 times slower than on a linear fragment .
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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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