2 hr survival after a 3H-thymidine injection on E16 (anterior coronal)
Figure 47. A coronal slice through the parenchyma of the olfactory bulb in the basal forebrain in an E16 embryo 2 hrs after exposure to 3H-thymidine. Proliferating cells in the olfactory nerve surround the unlabeled differentiating neurons—possibly output neurons in the future AOB. There is also heavy label uptake in the olfactory epithelium in superficial and deep locations, indicating two different populations of proliferating cells. Many proliferating cells are scattered in the developing bones and other organs of the skull.