Dorsoventral patterning of the telencephalon is established early in forebrain development and underlies many of the regional subdivisions that are critical to the later organization of neural circuits in the cerebral cortex and basal ganglia. Sonic hedgehog (Shh) is involved in the generation of the ventral-most telencephalic cells, but the identity of the extrinsic signal(s) that induce dorsal character in telencephalic cells is not known. Here we show in chick embryos that sequential Wnt and fibroblast growth factor (FGF) signaling specifies cells of dorsal telencephalic character.
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