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Expression of BDNF and trkB mRNA in the dentate gyrus of intact rats following treatment with l-NAME (50 mg/kg/day) for 7 days. Above: sections showing expression of the two mRNAs by in situ hybridization. Below: effects on optical density values in the dentate gyrus. Values are mean ± SEM. *P < 0.05, **P < 0.001 compared with control.
