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Since the acute interference with BDNF - signaling did not completely block MF - LTP , our results provide evidence that an additional mechanism besides BDNF induced TrkB signaling contributes to this type of LTP .
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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