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Conversely , regardless of dose , intra - habenular d - amphetamine did not alter rewarding effectiveness or operant rate , highlighting the differential contribution of mesoaccumbens and mesohabenular dopamine pathways to intracranial self - stimulation .
 Chemical: d - amphetamine; 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: d - amphetamine; Chemical: dopamine