6731
Plasma concentration and urinary excretion profiles were simulated and renal clearance ( CL ( r ) ) was calculated for two pharmacokinetic models describing active renal reabsorption ( R1 / R2 ) , two models describing active secretion ( S1 / S2 ) , and a model containing both processes .
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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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