title: Chromosomal studies in mentally retarded patients.
mesh_terms: D000328:Adult; D002648:Child; D002869:Chromosome Aberrations; D004314:Down Syndrome / Q000235:genetics*; D005260:Female; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D007621:Karyotyping; D008297:Male