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Uptake of radiolabeled gabapentin into cells in the presence of chemical inhibitors , siRNA or overexpressed drug transporters of interest was investigated .
 Chemical: radiolabeled gabapentin
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: radiolabeled gabapentin