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To study differences in longitudinal changes in regional cerebral blood flow (rCBF) between apolipoprotein E (APOE) epsilon4 carriers and noncarriers in nondemented older adults from the Baltimore Longitudinal Study of Aging using positron emission tomography in order to determine whether there are regionally specific longitudinal changes in rCBF in APOE epsilon4 carriers that might be related to its well-established role as a genetic risk factor for Alzheimer disease.

APOE ε4 Genotype and Longitudinal Changes in Cerebral Blood Flow in Normal Aging