Tau levels in the cortex (A, C-E) and hippocampus (B, F-H) of 4-10-month-old mice were determined by western blot analysis. (A, B) Representative western blots of cortical (A) and hippocampal (B) homogenates from mice of the indicated genotypes show levels of hTau (HT7) and total tau (Tau5). Actin served as a loading control. (C-H) Quantitation of western blot signals for full-length tau detected with the mTau/hTau cross-reactive antibodies Tau5 (C, F) or EP2456Y (D, G) or the hTau-specific antibody Tau12 (E, H). n = 3-8 mice per group. *P < 0.05, **P < 0.01, ***P < 0.001 by two-tailed unpaired t test (E, H) or by Welch's one-way ANOVA with post-hoc two-tailed Welch's t test (C, D, F, G). P values were Holm-adjusted for multiple comparisons. Values are means ± SEM. 