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A rare genetic syndrome that results from the partial duplication of the short arm of chromosome 4. It has a highly variable phenotype, principally with characteristics of psychomotor and language delay, seizures and dysmorphic features such as high forehead with frontal bossing, hypertelorism, prominent glabella, long narrow palpebral fissures, low set ears and short neck. Eye abnormalities (glaucoma, irregular iris pigmentation, hyperopia) have also been reported.
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