1878
The same pH dependence was observed for alkylation with iodoacetamide but the apparent rate constant , 107 M - 1 S - 1 at pH 7 . 2 , was about 20 - fold higher than the corresponding rate with iodoacetate .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Anatomy 
Text: {0} 
Answer:
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