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False-colour light micrograph of chromosomes from a blood cell of someone with Klinefelter's syndrome, a genetic disorder characterised by 3 sex chromosomes, XXY, rather than the normal XX female or XY male configurations. Persons affected are male in appearance, tall and thin with small testes. Normal sperm production fails (azoospermia), and there may be enlargement of the breasts (gynaecomastia) & an absence of facial or body hair. The chromosomes shown here might be used to produce a karyotype, a document of all of a cell's chromosomes arranged in homologous pairs that is used in diagnosis & screening. Magnification unknown.
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