title: Chromosomes and mental retardation.
mesh_terms: D002869:Chromosome Aberrations / Q000235:genetics*; D002872:Chromosome Deletion; D025063:Chromosome Disorders; D002874:Chromosome Mapping; D004314:Down Syndrome / Q000235:genetics; D005111:Extrachromosomal Inheritance; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*