Alzheimer; News from the web:

At first glance, Down syndrome and Alzheimer’s disease, two severe brain abnormalities, may seem to have little in common. Down syndrome is a hereditary disease, the source of which has long been recognized — a triplication of chromosome 21. By contrast, the overwhelming majority of Alzheimer’s cases (more than 95 percent) do not have a clear-cut genetic source. Instead, the disease, which usually becomes clinically apparent late in life, is caused by a perplexing constellation of factors. While these have been the focus of intense study for more than 100 years, few conclusive answers have come to light.

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