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Surgeons perform the first transplant of a genetically modified pig kidney into a living human at Massachusetts General Hospital in Boston. Michelle Rose/Massachusetts General Hospital hide caption

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Michelle Rose/Massachusetts General Hospital

First human transplant of a genetically modified pig kidney performed

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Finding some change in the blood of an Alzheimer's patient that accurately reflects the damaging changes in the brain has been tough. utah778//iStockphoto/Getty Images hide caption

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utah778//iStockphoto/Getty Images