title: Mental retardation, unusual facies, and abnormal nails associated with a group-G ring chromosome. A case report on two unrelated cases.
mesh_terms: D000293:Adolescent; D002648:Child; D002675:Child, Preschool; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D004431:Ear, External / Q000002:abnormalities; D005149:Facial Expression; D006801:Humans; D007223:Infant; D008607:Intellectual Disability / Q000235:genetics*; D007621:Karyotyping; D008297:Male; D009264:Nails, Malformed / Q000235:genetics*; D009396:Wilms Tumor