Reporter transgene expression in the brain. Widefield fluorescent dorsal (A) and ventral (B) views of an E14.5 mouse brain. (C) Dorsal view of a P2 mouse brain. Section through the whole olfactory bulb (D) and detail (E) showing GFP expression mostly in the periglomerular cells at P21. (F) Widespread transgene expression in the cortex at P9. Sections through a P21 brain showing GFP fluorescence in the septum, striatum (G), ventricle (H) and hippocampus (I). (J) Sagital section through a cerebellar lobe and detail of a fissure showing restricted expression at P9. (L) Transverse section through the spinal cord at E14.5. DG, dentate gyrus; Ep, external plexiform layer; GCL, granule cell layer; GL, glomerular layer; Ip internal plexiform layer; LV, lateral ventricle; ML, molecular layer; PCL, Purkinje cell layer; Sp, septum; St, striatum.