25328
Cholinergic and glutamatergic inputs into the ventral tegmental area ( VTA ) are crucial for modulating burst firing activity and subsequent phasic DA release in the nucleus accumbens ( NAc ) , but the specific VTA nicotinic receptor subtypes that regulate phasic DA release have not been identified .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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