title: A fragile secondary constriction on chromosome 2 in a severely mentally retarded patient.
abstract: A case is presented of an eighteen-year-old girl suffering from severe mental retardation associated with a fragile secondary constriction on the long arm of chromosome 2. The question of the relationship between the phenotypic and chromosomal abnormalities is discussed. We acknowledge the co-operation of Dr M. E. Elsarag and Dr K. M. Laurence in allowing this investigation to be made.
mesh_terms: D000293:Adolescent; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D002900:Chromosomes, Human, 1-3; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*