21377
Thus , the BoNT / A protease is uniquely well - adapted for selectively inactivating the SNAP - 25 directly involved in neurotransmission ; this together with the toxin ' s acceptor and its target being localised on the peri - somatic boutons likely contribute to its exceptional therapeutic utility in the clinic .
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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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