Colocalization of p75NGFR/CNPase and Immuno-EM. (a) GFP expression in the CNPase mouse in the olfactory nerve as it enters the OB and in scattered cells in the deep OB white matter. Immunostaining for p75 colocalizes with GFP in the olfactory nerve, but not in deep white matter (a–c). Immunoperoxidase staining for GFP in toluidine blue plastic sections (1 um) shows that the GFP was present in OECs in the outer nerve layer (d, e). Scale bars: in (a), pertains to (a–c) = 10 μm, (d) = 7, (e) = 10 μm.