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In this study , we examined the roles of lipopolysaccharide , a pro - inflammatory and inflammatory factor , treatment in modulating the methamphetamine - induced nigrostriatal dopamine neurotoxicity .
 lipopolysaccharide, methamphetamine, dopamine, neurotoxicity
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 lipopolysaccharide, methamphetamine, dopamine, neurotoxicity