Expression and localization patterns of CRMP4 mRNA in the olfactory bulb (OB) during development. (A,B,D–F) Representative images of CRMP4 mRNA hybridization signal in the OB at embryonic day (E) 15 (A), PD0 (B), PD7 (D), PD14 (E), and adult (8‐week‐old) mice (F). (Bʹ) Higher magnification of the boxed area in B. (C,C′) Images of hybridization signal at PD0, and an adjacent section immunohistochemically stained with Tbx21 antibody (green), respectively. Tbx‐21 is a specific marker of mitral cell nuclei. Arrowheads and arrows indicate the mitral cell and glomerular layers, respectively. White arrows in D,E, and F indicate hybridization signal in the rostral migratory stream. Scale bars: 200 μm (A,B,D–F), 50 μm (B′,C).