Figure 3. Correlation of Aβ levels between sera and brains. (A) A significant inverse correlation between Anti-Aβ antibody concentration and brain-soluble Aβ levels was revealed (r = −0.832, p < 0.0001). (B) Anti-Aβ antibody concentration tended to correlate with the Tris-insoluble Aβ42 level (r = −0.472, p = 0.0478). (C) Serum Aβ42 level correlates with the brain soluble Aβ42 level (r = 0.649, p = 0.0035). (D) Serum Aβ42 level also correlates with the brain Tris-insoluble Aβ42 level (r = 0.868, p < 0.0001).