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Plaque marker

In a PET scan, labeled PiB protein lights up when bound to amyloid plaques in the brain. A healthy person (top) has little binding compared with the high levels seen in an Alzheimer’s patient (middle). But high levels are also found in some healthy people with no cognitive problems (bottom). Credit: G. Rabinovici/UCSF, W. Jagust/LBNL

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