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Acetylcholine has traditionally only been regarded as a neurotransmitter of the parasympathetic nervous system , causing bronchoconstriction and mucus secretion in asthma and COPD by muscarinic receptor activation on airway smooth muscle and mucus - producing cells .
 Chemical: Acetylcholine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: Acetylcholine