The surprising reason some people's muscles suddenly turn into bone

Some rare diseases pull researchers in and don't let them go, and the unusual bone condition called fibrodysplasia ossificans progressiva has long had its hooks in Aris Economides. "The minute you experience it it's impossible to step back and forget it," says the functional geneticist who runs the skeletal disease program at Regeneron Pharmaceuticals in Tarrytown, New York.
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