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A decade ago, it seemed inevitable that every newborn would get a complete gene scan. But there are technical challenges and practical concerns. Brooke Pennington/Getty Images hide caption

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Brooke Pennington/Getty Images

The Promises And Pitfalls Of Gene Sequencing For Newborns

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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