APP and Alzheimer disease: The mean gray values of Abeta deposition were AD+NS vs. AD+Dex, 1.0 ± 0.08 vs. 0.85 ± 0.10 AU, p = 0.02, and AD+Dex vs. AD+Dex+Y, 0.85 ± 0.10 vs. 1.07 ± 0.08 AU, p < 0.001 (Figure 2C).