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Before dawn on a March morning, Doug Whitney walked into a medical center 2,000 miles from home, about to transform from a mild-mannered, bespectacled retiree into a superhuman research subject.
First, a doctor inserted a needle into his back to extract cerebral spinal fluid — “liquid gold,” a research nurse called it for the valuable biological information it contains. Then, the nurse took a sample of his skin cells. After that came an injection of a radioactive tracer followed by a brain scan requiring him to lie still for 30 minutes with a thermoplastic mask over his face. Then, another tracer injection and another brain scan.
During his three-day visit to the center, at Washington University School of Medicine in St. Louis, he also had cognitive assessments, neurological evaluations and blood draws that extracted multiple tubes for analysis.
For 14 years now, Mr. Whitney has been the one-person focus of exceptionally detailed scientific investigation, for which he travels periodically to St. Louis from his home in Port Orchard, Wash. It is not because he is ill. It is because he...