13304
Oligomers of the 40 and 42 residue amyloid - beta peptides ( A beta 40 and A beta 42 ) have been implicated in the neuronal damage and impaired cognitive function associated with Alzheimer ' s disease .
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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:
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