Amy Mitchell started getting sick in 2012. Dizzy spells and fatigue became a part of her daily life, followed by numbness in her limbs and painful muscle spasms. After half a dozen doctors over two years couldn’t tell her what was wrong, she sent away for a 23andMe kit. At the time, the consumer DNA-testing company was only giving ancestry reports—the Federal Drug Administration had recently shut down 23andMe’s health information ambitions.

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