<p>Along with a vehicle exposed control (A, F, K), representative examples of the cyclopamine-exposed NC (B, G, L), CPO (C, H, M) UL-CLP (D, I, N), BL-CLP (E, J, O), groups are shown. For each example, a coronal MRM section (A–E) showing normal separation between the cerebral hemispheres (arrow) and the secondary palate (arrow head) is shown above a reconstruction of the face and brain (F–J) and a transverse section through the forebrain (K–O). Complete separation of the cerebral hemispheres is evident in each of the reconstructed brains. Transverse sections show normal division of the cerebral cortices with an intact septal region. These images also illustrate deficiency of the pituitary (arrow in G) and olfactory bulbs, and enlargement of the third ventricle (arrow head in M) and septal region in cyclopamine-exposed fetuses. Color-coding in F-O is shown in Fig. 1, where dark red = cerebral cortices, light green = diencephalon, dark blue = septal region, yellow = lateral ventricles, orange = third ventricle, pink = olfactory bulbs, light purple = pituitary.</p
