21369
In search of a basis for the impressive potency of an endoprotease that cleaves SNAP - 25 , botulinum neurotoxin type A ( BoNT / A ) , in treating numerous diseases due to hyper - active autonomic nerves , truncation of its target and inhibition of neurotransmission were studied in rat sympathetic neurons .
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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