25548
Mechanistically , studies showed that AHS markedly reduced the content and deposition of beta - amyloid peptide ( A beta ) by inhibiting the expression of mRNA for amyloid protein precursor , beta - site amyloid cleaving enzyme - 1 and cathepsin B and promoting the expression of mRNA for neprilysin and insulin degrading enzyme .
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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:
 None