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Because both glutamate and dopamine are required to induce and sustain MSNs plasticity , the particular molecular mechanisms involved at this synaptic triad are difficult to understand .
 Chemical: glutamate; 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: glutamate; Chemical: dopamine