5098
To study the role of GSK - 3 in A beta pathology , we used 5XFAD mice co - expressing mutated amyloid precursor protein and presenilin - 1 that develop massive cerebral A beta loads .
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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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