As part of the search for ways to catch Alzheimer's disease at its initial stages, scientists have been conducting trials with a radioactive dye called Pittsburgh Compound B, which has made it possible to utilize PET scans to detect deposits of amyloid -- a protein linked to the disease -- in the human brain. Studies with the compound have already identified major deposits in 20% to 25% of seemingly normal people over 65 that indicate they may develop Alzheimer's in the future.

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