GAP43 and Alzheimer disease: Conversely, the number of GAP43-positive neurons in WT mice was similar to that of vehicle-treated 3xTg-AD mice (compared with vehicle-treated mice (12.25 ± 3.76), CA1-CA2, p = 0.45; CA3 vehicle (57.83 ± 7.64), p = 0.97) (Fig. S4F).