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Bright-field photomicrographs of sections processed for in situ hybridization histochemistry with35S-labeled DNA probes for the rat GluR1(A, B) and GluR2 (C, D) mRNAs and a cRNA probe for the monkey NMDAR1 mRNA (E, F). Labeled neurons are shown in theVTA (A, C, E) and theSNc-v (B, D, F). Thearrows indicate labeled perikarya, whereas thearrowheads point to unlabeled glial cells. Scale bar (shown in B): 20 μm.
