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Programmed cell death, or apoptosis, has been implicated in Alzheimer's disease. Mutations in the presenilin (PS) genes, PS1 and PS2, are a major cause of early-onset familial Alzheimer's disease (FAD). Previous studies have suggested that the PS play a role in apoptosis. However, the mechanisms whereby presenilins affect apoptosis and the relationship of FAD-associated presenilin mutants to the apoptotic...