Type R2B gene expression in the adult mouse brain. In situ hybridization using digoxigenin-labeled riboprobes was used to localize the four R2B phosphatases in sagittal sections of a P180 male C57BL/6 mouse brain. PTPρ (A-E), PTPμ (F-J), PTPκ (K-O), and PCP-2 (P-T) transcripts were present in various regions of the CNS including the olfactory bulb, cortex, hippocampus, and cerebellum. Olfactory bulb: ac, anterior commissure; g, granule layer; m, mitral cell layer; gl, glomerular layer; epl, external plexiform layer. Cortex: cortical layers I-VI. Hippocampus: d, dentate gyrus; h, hilus; or, oriens layer; py, pyramidal layer; r, radiatum layer; GII, Golgi II neurons. Cerebellum: dcn, deep cerebellar nuclei; ml, molecular layer; P, Purkinje cell layer; g, granule cell layer; G, Golgi cells. Arrowhead (D) shows anterior-posterior cerebellar boundary. Scale bars: Columns 1, 2 and 3 = 50 μm; column 4 = 500 μm; column 5 = 100 μm.