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Fig. 4. Neocortical regionalization is not affected by Ebf1 inactivation. Sagittal sections of E17.5 heterozygous (left) and homozygous (right) Ebf1 mutants processed for in situ hybridization with the following probes: Id2 (A,B), COUP-TFI (C,D), Cdh6 (E,F), Epha7 (G,H) and Cdh8 (I,J). Arrowheads indicate rostrocaudal boundaries or changes in gene expression. These boundaries or gradients of expression are not changed in Ebf1-/- mutant embryos. H, hippocampus; Ncx, neocortex; OB, olfactory bulb; Str, striatum.