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Representative sagittal sections showing c-Fos expression in mitral and granule cells of the accessory olfactory bulb. A and B, saline control mice exposed to female urine placed on external nares (A) or only to urinary vapor (B). C and D, ZnSO4 treated mice exposed to female urine placed on external nares (C) or only to urinary vapor (D). GR: granule cell layer. M: mitral cell layer. GL: glomerular cell layer. Calibration bar: 100 microns.
