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• Barr body - Wikipedia, the free encyclopedia

  In those species (including humans) in which sex is determined by the presence of the Y or W chromosome rather than the diploidy of the X or Z, a Barr body is the inactive X ...

• Sex Chromosomes

  However, a dense, stainable structure, called a Barr body (after its discoverer) is seen in the interphase nuclei of female mammals. The Barr body is one of the X chromosomes.

• Barr's body (www.whonamedit.com)

  Barr's body: Mass of condensed sex chromatin in the nuclei of normal female somatic cells due to inactive X chromosome.