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In situ localization of lacZ mRNA in hippocampus. (A) In situ hybridization using a lacZ-specific oligonucleotide probe. SM (stratum molecular), dendritic layer of the dentate gyrus granule cells; SR (stratum radiatum), dendritic layer of the CA1 pyramidal cells. (B) X-gal staining of hippocampus from 20-μm horizontal sections as described in Fig. 2. (Bar = 300 μm.)
