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Recent studies have shown that BDNF regulates the transport of mRNAs along dendrites and their translation at the synapse , by modulating the initiation and elongation phases of protein synthesis , and by acting on specific miRNAs .
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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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