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Somatostatin-like immunoreactivity (SLI) and neuropeptide Y-like immunoreactivity (NPYLI) were measured in the cerebral cortex of 49 patients with Alzheimer's disease (AD), and 9 elderly controls. Concentrations of SLI were lower in AD patients relative to controls in 9 of 10 cortical regions. In contrast, no significant differences in NPYLI concentrations between the two groups were observed in any of 10 regions. These studies suggest a dissociation between SLI deficits and NPYLI concentrations in the postmortem cerebral cortex of AD patients. The apparent sparing of NPYLI-containing neurons suggests that neuropeptide Y may be located within a separate group of neurons compared to somatostatin.
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