Molecular geneticists studying an autoradiograph for the presence of 'Fragile-X syndrome', Great Ormond Street Hospital, London, May 2000. Fragile-X syndrome is the most common cause of inherited mental impairment, affecting about one in 5000 boys and one in 2500 girls. In addition to learning difficulties, people with Fragile-X syndrome may have other symptoms, including anxiety and hyperactivity. Boys are usually more severely affected than girls. Diagnosis of Fragile-X syndrome is important as special education and therapy can help affected children.
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