Experimental design. (A) Timeline of in vivo experiments. (B) Schematic drawing of the dorsal region of a mouse head. The gray dotted area represents the location of the right olfactory bulb that was resected for the experiment. The dotted lines indicate sutures used for orientation. NAC, N-acetylcysteine; NS, normal saline; OMP, Olfactory Marker Protein; BrdU, 5’-Bromodeoxyuridine; GAP43, Growth associated protein 43 kD.