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Regions enriched in mGlu ( 2 ) receptors included the medial prefrontal cortex , select hippocampal regions , the medial mammillary nucleus , the medial habenula , and the cerebellar granular cell layer .
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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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