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Beta-amyloid production results from cleavage in the extracellular domain of APP by the beta-secretase (BACE1) , which results in the production of the APP C-terminal fragment C99. This fragment is further cleaved by the gamma-secretase at residues 40-42 to produce beta-amyloid 40 and 42 peptides. Beta-amyloid aggregation and neuritic plaque formation are pathologic hallmarks of Alzheimer disease. This fragment is the amino terminus (1-28) of beta amyloid.