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Injection of Aβ into the frontal cortices impaired memory. A) Leaning trial on the third day after Aβ injection as indicated by the number of shocks to learn not to enter the dark chamber during 300s period. B) The first retention trial, 24 h after learning trial and C) The second retention trial one week after the first retention trial. *P=0.019 and ***P=0.001 compared to control group. Analysis was done by one-way ANOVA with Turkey post-hoc test.
