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'You think, "My daughter is 4 - she shouldn't have these problems." But if you were 94, you'd say, "That's part of aging." '

Eva Balcells, a 4-year-old with a rare genetic flaw in her mitochondria, played at home last month as her mother, Cristy, looked on. Eva Balcells, a 4-year-old with a rare genetic flaw in her mitochondria, played at home last month as her mother, Cristy, looked on. (Pat Greenhouse/Globe Staff)
By Carolyn Y. Johnson
Globe Staff / September 15, 2008

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HINGHAM - Eva Balcells giggles happily as she plays on the floor, but the 4-year-old moves with the deliberate caution of a frail elderly person, her arm trembling as she reaches in slow motion to grasp a toy car. (Full article: 1009 words)

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