A Family’s Race to Cure a Daughter’s Genetic Disease

One July afternoon last summer, Matt Wilsey distributed small plastic tubes to 60 people gathered in a Palo Alto, California, hotel. Most of them had traveled thousands of miles to be here; now, each popped the top off a barcoded tube, spat in about half a teaspoon of saliva, and closed the tube. Some massaged their cheeks to produce enough spit to fill the tubes.

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