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16.5% urea/tricine/tris SDS-PAGE of Aβ peptides (1-38, 1-40, 1-42) eluted by the various elution reagents: 0.05% trifluoroacetic acid (TFA; pH 2.3), 0.25% formic acid (FA; pH 2.35), 0.16% ammonium hydroxide (OH; pH 11.0), and 100 mM ammonium bicarbonate (NH4HCO3; pH 8.0); molecular weight standard 1.4–26.6 kDa (MW, BioRad).
