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Neurotoxicity of Aβ40, Aβ42, E22Δ-Aβ40, E22Δ-Aβ42, and E22P-Aβ42 with the indicated concentration (1, 2, 5, 10, and 20 μM) using primary rat cortical neuronal cell cultures after 48-hr incubation at 37°C. Data are expressed as the mean ± s.e.m. *P < .05 versus vehicle, **P < .01versus vehicle. Veh: vehicle.
