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In addition , we show that 5 - HT1ARs determine the orientation of the synaptic plasticity towards LTP or LTD or no plasticity through the modulation of NMDAR - mediated currents .
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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