title: Organic brain syndrome and chromosome loss in aged twins.
mesh_terms: D000368:Aged; D000375:Aging; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D004200:Diseases in Twins; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007361:Intelligence Tests; D002537:Intracranial Arteriosclerosis / Q000150:complications; D007621:Karyotyping; D008297:Male; D008606:Mental Processes; D019965:Neurocognitive Disorders / Q000150:complications*; D009457:Neuroglia; D011446:Prospective Studies; D011581:Psychological Tests; D012737:Sex Factors