3951
The alpha 7 nicotinic acetylcholine receptor ( nAChR ) subtype is abundantly expressed in the central nervous system and in the periphery .
 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