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Huntington's disease is the result of a genetic defect on chromosome 4. This defect causes an excessive repetition of a section of the DNA on this chromosome. A unique characteristic of this disease is that as this gene gets passed down from generation to generation, the number of repeats of this DNA section increases. The more repeats that occur, the greater the chances of the carrier to develop symptoms of the disease at a younger age.

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12y ago

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