Area of the GER as a function of age. We examined GER areas in non-Tg and R75W + mice at P8 (n = 5), P10 (n = 5), and P12 (n = 5). For both non-Tg and R75W + mice, there were no significant differences among P8, P10, and P12. Between non-Tg and R75W + mice, the GER was significantly larger in R75W + mice at P12 (*p ≤ 0.05). These data are expressed as mean ± SEM.