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Dopamine transporter knockout ( DAT KO ) mice exhibit elevated extracellular dopamine levels in brain regions that include the striatum and the nucleus accumbens , but not the prefrontal cortex .
 Chemical: Dopamine; Chemical: dopamine
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: dopamine