2 hr-survival after a single 3H-thymidine injection on E19 (sagittal)
Figure 95 is a sagittal slice through the olfactory bulb and nasal cavity in an E19 embryo exposed to 3H-thymidine 2 hrs before death. The NEP and SVZ are active proliferation zones throughout all parts of the forebrain. Labeled cells outside the NEPs and SVZs are locally multiplying glial precursors. The most active SVZ is outside the basal ganglionic NEP. Locally-multiplying glia in the olfactory nerve also have heavy label uptake, and the olfactory epithelium is actively proliferating with two different populations of proliferating cells.