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GAP43 immunostaining in the olfactory epithelium of wild-type (A, wt) and OCNC1-null (B, ko) mice. Fewer neurons (small arrows) are stained with GAP43, indicating that the number of both mature and immature neurons is lower in the null mice. The double arrows indicate the difference in the thickness of the olfactory epithelium (oe). lp, Lamina propria; nc, nasal cavity; s, septum. Scale bar, 30 μm.
