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also need a failure of the brain's stress response system," said Bruce Yankner, Harvard Medical School professor of genetics and leader of the study, in a release. "If true ... more than 5 million Americans currently living with Alzheimer's disease," said Yankner, who in the 1990s was the first to demonstrate the toxic effects of amyloid beta, the hallmark ... researchers examined trouble spots in the brain's ability to protect itself over time. Yankner said the study suggests a person may be able to resist the toxic effects