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The group III metabotropic glutamate receptors ( mGlu4 , mGlu6 , mGlu7 and mGlu8 receptors ) remain the least investigated glutamate receptor subtypes partially due to a delay in the development of specific pharmacological tools .
 Chemical: glutamate; Chemical: glutamate
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: glutamate