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Healing 'Butterfly Children': Treatment Brings New Hope

17-month-old Elisa McCann is living with Epidermolysis Bullosa, a rare and debilitating skin disease. Her condition has been rapidly improving after she underwent an experimental bone marrow transplant in May of 2014. Samantha Okazaki / TODAY

Epidermolysis bullosa, or EB, is a genetic disorder in which layers of the skin don’t anchor together properly, causing friction that leads to massive, painful blistering.

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