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You might not think about your bones very often unless you break one. When you break a bone, the bone heals itself and begins to regrow. But, what if your muscles, tendons and ligaments turned to bone? What if you formed a second skeleton on top of the one you already have? That's what happens with Fibrodysplasia Ossificans Progressiva, or FOP.

Unexpected discoveries in the quest to cure an extraordinary skeletal condition show how medically relevant rare diseases can be.