The neuronal specific marker NeuN does not label all GLL neurons. 10× images of sagittal sections shown to compare the immunofluorescent staining of NeuN (A) to that of the fluorescent Nissl stain NT (B) within the olfactory bulb. NT stains a much larger number of cells in the GLL. Scale bars, 148 μm. NeuN, neuronal nuclei; GLL, glomerular layer; NT, NeuroTrace; GCL, granule cell layer; MCL, mitral cell layer; EPL, external plexiform layer.