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Male Sprague - Dawley rats were implanted with bilateral cannulae in the nucleus accumbens shell , core or in the lateral habenula and a monopolar stimulation electrode in the posterior mesencephalon , a brain site that is sensitive to changes in dopamine transmission .
 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