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As the most potent dose ( 1 mg / kg ) of lipopolysaccharide was administered two weeks , one day before or after the methamphetamine dosing regimen , methamphetamine - induced striatal dopamine and 3 , 4 - dihydroxyphenylacetic acid depletions remained unaltered .
 lipopolysaccharide, methamphetamine, methamphetamine, dopamine, 3 , 4 - dihydroxyphenylacetic acid
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, methamphetamine, dopamine, 3 , 4 - dihydroxyphenylacetic acid