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2625 pages added, reviewed or updated during the last month (last updated: 15/4/2021)


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Barr body

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This is an inactivated X chromosome in the form of tightly-coiled heterochromatin that appears as a discrete, recognisable entity on light microscopy.

Its presence can be used in the sexing of a baby; it is searched for in liquor obtained by amniocentesis, or in cells derived from chorionic villus sampling.

Last reviewed 01/2018

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