6734
Tubular secretion models ( S1 / S2 ) yielded similar relationships between Michaelis - Menten parameter perturbations and CL ( r ) , but the predicted CL ( r ) values were threefold higher for model S1 .
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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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