We are all unwitting players in a genetic lottery. Take a gene called APOE. It comes in three flavors - APOE2, APOE3 and APOE4. All three are considered normal human genes, but people who were dealt an APOE4 face three to five times the average risk of getting Alzheimer’s disease. Since we inherit a copy of the gene from each parent, a few unlucky people will be stuck with two copies of the APOE4 version and face an even higher risk.
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