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Group III metabotropic glutamate receptors ( mGluR4 , 7 , 8 ) are widely distributed in the basal ganglia .
 Chemical: glutamate
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: glutamate 
Answer:
 Chemical: glutamate