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Group II metabotropic glutamate ( mGlu ) receptors are known to induce a long - term depression ( LTD ) of synaptic transmission in many brain regions including the amygdala .
 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