The number of each cell type (C) in each of the subregions is estimated as: C = ΣQ- × t/h × 1/asf × 1/ssf, where Q- is the number of cells actually counted in the dissectors that fell within the sectional profiles of the subregion seen on the sampled sections, and Asf is the areal sampling fraction calculated by the area of the counting frame of the dissector, a(frame) (of 50 × 50 μm2 in this study) and the area associated with each x, y movement, grid (x, y step) (of 250 × 250 μm2 in this study) {asf = (a(frame)/a(x, y step))}.