2040
The specificity and sensitivity of this method ( limit of detection in plasma 0 . 025 micrograms / mL and < or = 0 . 0125 micrograms / mL for febantel and its metabolites , respectively ) were sufficiently high to enable us to characterize the time course of the drug in the plasma after oral administration of therapeutic doses to sheep .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None