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Attenuation of methamphetamine seeking by the mGluR2 / 3 agonist LY379268 in rats with histories of restricted and escalated self - administration .
 Chemical: methamphetamine; Chemical: LY379268
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: methamphetamine; Chemical: LY379268