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A, Representative autoradiogram showing MR mRNA in situ hybridization signal within the rhesus monkey hippocampal formation. Note the high levels of MR mRNA detected within the DG and Ammon's horn subfields, specifically within CA2-CA3 subfields. B, Hybridization signal detected when using the sense cRNA radiolabeled probe in adjacent sections. Scale bar, 1.5 mm.
