Immunohistochemical analysis of NAC-treated mouse OE following unilateral bulbectomy. Sections were stained to label mature neurons (OMP); immature neurons (GAP43), proliferative cells (BrdU) or apoptosis (Caspase 3). NAC treatment resulted in an increase in OMP (+) neurons. NAC, N-acetylcysteine; NS, normal saline; OMP, Olfactory Marker Protein; BrdU, 5’-bromodeoxyuridine; GAP43, Growth associated protein 43 kD. Nuclei are counterstained with DAPI (blue). N=4–6 animals per condition,* indicates p=0.02, unpaired t test. Bar=20 μm.