With the muscular form of Michelangelo's David setting hearts a-flutter outside the Galleria dell'Accademia, and comely Renaissance maidens in every gallery, it's the artistic heart of Florence that plucks at the heart strings.

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Matt is one of 13, 000 boys in the U.S. who have a rare form of muscular dystrophy known as Duchenne.

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But Lady Campbell has a severe form of spinal muscular atrophy, a condition that means she uses a wheel chair and is reliant on a ventilator to breathe for much of the day.

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In effect, Duchenne patients could develop a milder form of the disease, known as Becker muscular dystrophy, says Petra Kaufmann, a neuromuscular researcher who directs the Office of Clinical Research at the National Institute of Neurological Disorders and Stroke.

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