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As both inhibitors and substrates increase extraneuronal dopamine levels , it is often assumed that all DAT ligands posses an addictive liability equivalent to cocaine .
 Chemical: dopamine; Chemical: cocaine
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: cocaine