(A - C) Coronal forebrain sections from I12b-Cre;Z/EG animals at E12.5 (A), E15.5 (B), and P0 (C) were double-labeled for DLX2 (red), CRE (green) and counterstained for cell nuclei with DAPI (blue). The boxed regions in (A-C) are shown at higher magnification in (A′-C′). In A′-C′, the boxed regions are shown at higher magnification in A″-A‴, B″-B″″, and C″-C″″. DLX2-only expression is shown in A″, B‴, and C‴, CRE-only expression is shown in A‴, B″″, and C″″, and both DLX2 and CRE expression is shown in A′, B″ and C″. In contrast to CRE expression, DLX2 expression is high in the ventricular zone (VZ). CRE and DLX2 are co-expressed within the subventricular zone (SVZ) at all ages examined. Scale bars in A, B, C = 500 μm.