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In situ hybridization of the NR1 subunit mRNA of the NMDA receptors in 22 week old male mice. Parasagittal brain sections with enlarged inserts of the hippocampus in control (A) and mutant (B) mice. Arrowheads indicate scattered hybridization signals that are likely derived from CA3 interneurons. Scale bar, 100 μm; scale bar in inset, 25 μm.
