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Page: Fragile X Syndrome
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Fragile X syndrome, also known as the Martin-Bell syndrome, is a syndrome of X-linked mental retardation. Boys with the syndrome may have large testes (macroorchidism), prognathism, hypotonia and autism, and a characteristic but variable face with large ears, long face, high-arched palate, and malocclusion. Additional abnormalities may include lordosis, heart defect, pectus excavatum, flat feet, shortening of the tubular bones of the hands, and joint laxity. Females who have one fragile chromosome and one normal X chromosome may range from normal to mild manifestations of the fragile X syndrome. The fragile X syndrome has an estimated incidence of 1 in 3600 males and 1 in 4,000-6,000 females.
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