3359
Pretreatment by specific antagonists of alpha7 - nicotinic acetylcholine receptor ( alpha 7nAChR ) , but not muscarinic acetylcholine receptor ( mAChR ) or alpha 4 beta 2nAChR , decreased the neuroprotection of B12H .
 Chemical: acetylcholine; Chemical: acetylcholine; Chemical: B12H
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; Chemical: acetylcholine; Chemical: B12H