In situ hybridization of RIM mRNAs in the rat brain. (A) Film images showing the distribution of RIM mRNAs in the adult rat brain (CB, cerebellum; CX, cerebral cortex; DG, dentate gyrus; HC, hippocampus; MB, midbrain; OB, olfactory bulb; Pn, pontine nucleus; sTn, subthalamic nucleus; ST, striatum; TH, thalamus; MO medulla oblongata). (B) Dark-field images of emulsion-dipped sections from rat hippocampus, olfactory bulb, and cerebellum (AON, anterior olfactory nucleus; DG, dentate gyrus; EPL, external plexiform layer; GL, glomerular layer; GRL, granule cell layer; MCL, mitral cell layer; ML, molecular layer; PCL, Purkinje cell layer; scale bar B, a–d=100 μm, B, e–f 20 μm).