Sex chromosome abnormalities in mentally defective children. A case of XXXY Klinefelter's syndrome and a buccal smear survey in 743 institutionalized patients in Tokyo.
D000293:Adolescent; D006801:Humans; D008607:Intellectual Disability / Q000235:genetics*; D007713:Klinefelter Syndrome / Q000235:genetics*; D008297:Male; D012728:Sex Chromatin