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In conclusion , a robust P - gp HCV replicon cell - based assay has been developed to measure the effect of the P - gp efflux pump on the potency of different classes of HCV replication inhibitors .
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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:
 None