Nobel Prize-winning scientist Paul Greengard has discovered a new way for researchers to target Alzheimer's disease. Beta amyloid, the plaque that builds up in the brains of Alzheimer's patients, has long been targeted by researchers. Now Greengard has discovered a new protein that is needed to make beta amyloid, reports the New York Times' Gina Kolata. Many Alzheimer's drugs currently being studied target the enzyme gamma secretase, which helps make beta amyloid.

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