Cultured OECs from the CNPase transgenic mouse maintain their GFP expression. (a–d) Immunostaining of cultured olfactory bulb OECs derived from the eGFP-CNPase mouse indicates colocalization with p75. Nuclei stained blue with DAPI. Note the small cluster of spindle-shaped OECs and a more flattened OEC (upper left) both colocalize GFP (CNPase) and p75. Scale bar: (a) = 5 μm.