Sagittal sections at E12.5. Sagittal sections of the brain at E12.5. Front is to the left. In situ hybridization for MTGR1 (A,B), Neurog2 (C,D), MTG8 (E,F), MTG16 (G,H), and Ascl1 (I,J) is shown. nCx, neocortex; Th, thalamus; EMT, eminentia thalami; HT, hypothalamus; PT, pretectum; HB, hindbrain; Aq, cerebral aquaduct; 4v, fourth ventricle; SC, superior colliculus; IC, inferior colliculus; Cb, cerebellum. Scale bar = 500 μm.