In Preventing Alzheimer’s, Mutation May Aid Drug Quest - nytimes

A study of a rare gene mutation that protects people against Alzheimer’s disease provides the strongest evidence yet that excessive levels of a normal brain substance, beta amyloid, are a driving force in the disease — bolstering hopes that anti-amyloid drugs already under development might alter the disease’s course or even prevent it. - In Preventing Alzheimer’s, Mutation May Aid Drug Quest