New familial forms of cerebral amyloid and dementia.

Discusses the role played by progressive deposition of amyloid beta proteins in familial Alzheimer's disease (AD). Characteristics of the brains of patients suffering from AD; Correlation of mutations in the amyloid precursor protein on chromosome 21 or presenilins 1 and 2 genes to the autosomal dominant forms of familial AD; Characteristics of familial British dementia and familial Danish dementia.