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Pairs of photomicrographs showing cRNA probe hybridization to NMDAR1 mRNA (A) or actin mRNA (C) in cultured rat hippocampal neurons visualized under dark-field (A, C) or phase-contrast optics (B, D). NMDAR1 mRNA hybridization is evident within neuronal somata and along dendrites, two of which are shown by arrowheads. Actin mRNA is confined to the neuronal somata (C). Scale bar, 50 μm.
