[THE CAUSE OF FEEBLE-MINDEDNESS].
D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D000013:Congenital Abnormalities; D004314:Down Syndrome; D005826:Genetics, Medical; D006801:Humans; D008607:Intellectual Disability
ABNORMALITIES; CHROMOSOME ABNORMALITIES; GENETICS, HUMAN; MENTAL RETARDATION; MONGOLISM