Expression of Olf-1 in adult olfactory epithelium. Olf-1 protein was localized to the nuclei of olfactory neurons of an adult mouse using an anti-Olf-1 peptide antibody. Immunoreactive GBC nuclei are indicated (arrows), as are the locations of sustentacular cell layer (SCL), neuronal cell layer (NCL), basal cell layer (BCL), basal lamina (BL), and lamina propria (LP).