Season 36 Episodes14
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In this report, Horizon investigates the rare disease called Fibrodysplasia Ossificans Progressiva, which causes muscles and ligaments to turn into solid bone. This disease causes severe disfigurement and suffering, and often-time death. We look at the research by scientists trying to find out the causes
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"Skeleton Key" is episode 8 of Horizon season 36. It aired on March 25, 1999.