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Previous work has also revealed that animals with partial dopamine loss induced by a neurotoxic regimen of methamphetamine fail to exhibit further decreases in striatal dopamine when re - exposed to methamphetamine 7 - 30 days later .
 Chemical: dopamine; Chemical: methamphetamine; Chemical: dopamine; Chemical: methamphetamine
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: dopamine; Chemical: methamphetamine; Chemical: dopamine; Chemical: methamphetamine