Accelerated transition from immature to mature OSNs begins at 7 days post basal cell division. (a) GAP-43 and EdU co-staining at 1, 5, 7, and 9 days post-EdU injection (DPI). Co-immunolabeled cells are rare at 1 DPI, abundant at 3, 5, and 7 DPI, and decrease by 9 DPI. (b) OMP and EdU co-staining. Co-immunolabeled cells are most abundant at 9 DPI. (c) Quantification of marker (+)/EdU (+) cells out of the total number of counted EdU (+) cells; the mean and SEM are plotted (n = 3). Dotted white line indicates the basal lamina, scale bar in B represents 20 μm and applies to A as well, while scale bar in inset B3 represents 10 μm and applies to all insets. * p <.05, ** p <.01, *** p <.001