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Although BDNF is abundant at hippocampal mossy fiber ( MF ) synapses , which critically contribute to hippocampus dependent memory , its role in MF synaptic plasticity ( long - term potentiation , LTP ) remained largely unclear .
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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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