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Some of the most well studied functions of group I mGluRs , such as initiation of multiple forms of mGluR - dependent long - term depression , require receptor localization near the post - synaptic density ( PSD ) .
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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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