title: A probable XXYY sex determining mechanism in a mentally defective male with Klinefelter's syndrome.
mesh_terms: D006801:Humans; D008607:Intellectual Disability; D007713:Klinefelter Syndrome; D008297:Male; D008499:Medical Records; D011336:Probability; D019849:Sex Determination Processes; D012737:Sex Factors
keywords: MENTAL DEFICIENCY/case reports; SEX DETERMINATION