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For over a decade , it has been known that amyloid beta ( A beta ) peptides of Alzheimer ' s disease bind to the nicotinic alpha 7 acetylcholine receptor ( AChR ) with picomolar affinity , and that snake alpha - neurotoxins competitively inhibit this binding .
 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