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A Barr body is the inactivated X chromosome that is usually found in the nuclei of female somatic cells. It can also occur in males when there is an abnormality and the male is XXY instead of the normal XY, a condition known as Klinefelter's syndrome.
Barr body A condensed clump of CHROMATIN occurring in the nucleus of cells in normal females and corresponding to an inactive X chromosome. The Barr body also occurs in males with two or more X chromosomes an addition to the Y chromosome.