13783
Furthermore , mGlu5 has been shown to play an important role in hippocampal synaptic plasticity , specifically in long - term depression ( LTD ) and long - term potentiation ( LTP ) , which is thought to be involved in cognition .
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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:
 None