Source:http://linkedlifedata.com/resource/umls/id/C0221033
JABL: A rare chromosomal aberration characterized by the presence of three X (female) chromosomes. The condition does not exhibit a distinctive phenotype and majority of the affected females are physically and mentally normal. Abnormalities are infrequent and do not occur with any regularity--they include hypertelorism, epicanthal folds, depressed nasal bridge, kyphosis and variable other anomalies. Delay in growth and mental development, when present, is usually mild. Occasionally associated with Prader-Willi syndrome.,NCI: A form of chromosomal variation characterized by the presence of an extra X chromosome in each cell of a human female.