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Input and synapse specific Hebbian plasticity , such as long - term potentiation ( LTP ) and long - term depression ( LTD ) , are critical for sculpting the nervous system to wire its circuit in tune with the environment and for storing memories .
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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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