Bernard Gilly, Gensight CEO (Eric Piermont/AFP via Getty Images)

They thought their gene ther­a­py failed. In­stead, it spawned a med­ical mys­tery

José-Alain Sa­hel was on a rare va­ca­tion in Por­tu­gal in the spring of 2018 when his phone rang with grim news: The gene ther­a­py he …

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