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Sarepta Therapeutics said Monday that three children born with a rare muscle-wasting disease called limb-girdle muscular dystrophy are showing durable improvements in strength and function a year after a one-time infusion of an experimental gene therapy.

Three more children have been treated with a higher dose of the same gene therapy. Initial biopsy results from those patients, also reported Monday, show greater production of a key muscle protein with no added safety problems — suggesting the higher dose could lead to even larger improvements in muscle function. Those tests will be performed later this year, Sarepta said.

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