The Genetics of Alzheimer's Disease.- APP Biology, Processing and Function.- The Biology of the Presenilin Complexes.- ?-secretase: Physiological Role and Target Validation.- Cognitive Impairment in Transgenic A? and Tau Models of Alzheimer's Disease.- Cholesterol and ?-Amyloid.- A? Structure and Aggregation.- Signaling Mechanisms that Mediate A? Induced Neuronal Dysfunction.- Beta Amyloid and Excitatory Synapses.- A? Degradation.- Role of A ? Transport...