Suppose you are at risk of a genetic disease that threatens to render you unrecognizable to yourself. Physically, you realize, the disease will slowly erode your body to an incontinent mass of uncontrollable jerks and twitches. Mentally, it will eat away at your brain cells, impeding your ability to remember, pay attention, reason. And emotionally, it will blacken your days with irritability and all-consuming depression. Worst of all, you know that the disease cannot be prevented or stalled, arrested or cured. To learn that you have the offending gene is to receive a virtual death sentence that leaves only two questions...
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