888
The aim of this study was to examine the role of metabotropic glutamate receptor 5 ( mGluR5 ) in the toxic action of methamphetamine on dopaminergic neurones in rats .
 glutamate, methamphetamine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 glutamate, methamphetamine