?:definition
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A variant of the alpha-thalassemia/mental retardation syndrome (ATR) due to deletion of a segment of the short arm of chromosome 16. A form in which there is no deletion is termed \'alpha-thalassemia/mental retardation syndrome, nondeletion type\' (q.v.). The phenotype is variable and consists of mental retardation in association with different combinations of oro-facial, genital, and other abnormalities.
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