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Representative mass spectra from a sporadic AD patient displaying the Aβ isoform patterns from three different brain regions; the cerebellum, hippocampus and cortex. 1 Aβ4-40 [M+2H]2+, 2 Aβ4-42 [M+2H]2+, 3 Aβ1-40 [M+2H]2+ and 4 Aβ1-42 [M+2H]2+. Asterisk represents an unidentified peak
