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skos:definition |
JABL: Presence of an additional (third) chromosome in an otherwise diploid chromosome 9 with psychomotor retardation and multiple abnormalities of the craniofacial structures, heart, skeletal system, extremities, and other organs. Includes mosaic trisomy 9 syndrome.,NCI: A chromosomal abnormality consisting of the presence of a third copy of chromosome 9 in somatic cells.
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