Plexin-B2 is expressed in the postnatal and adult SVZ–RMS. Sections A–F are coronal. A–C, In the adult, in situ hybridization with Plxnb2 riboprobe showed that Plxnb2 is highly expressed in the RMS (A, B, arrowhead), in the glomerular layer (gl) (A, arrows), and in the subventricular zone (C, arrowhead). The insets in A and C are high magnification of the boxed area. D–F, β-Galactosidase immunohistochemistry also revealed similar expression patterns in all three regions (insets are high magnification of the boxed areas). G, Sagittal section of the telencephalon of P8 Plxnb2+/− mouse labeled for PLAP. PLAP is highly expressed in the RMS (arrowhead) and some olfactory axons (arrow). H, Sagittal section of the telencephalon in a P21 mouse immunolabeled with anti-Plexin-B2 antibodies. Plexin-B2 is highly expressed in the RMS (arrowhead) and some olfactory axons (arrow). Scale bars: A–E, 600 μm; F, 200 μm; G, 500 μm; H, 600 μm.