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Barr body

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Barr body  (bär)
n.
The condensed, inactive X-chromosome found in the nuclei of somatic cells of most female mammals. Also called sex chromatin.
[After Murray Llewellyn Barr (1908-1995), Canadian anatomist.]
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The underlying premise of these studies has been based on the Lyon hypothesis, which assumes that only one X chromosome is active in any female cell, the other X chromosome remaining in an inactive state as a Barr body, and that the X chromosome that is inactivated (methylated) is determined randomly.
Etiology and pathogenesis of uterine leiomyomas: a review. (Research ... by Dixon, Darlene / Environmental Health Perspectives
In 1959, Japanese cell biologist Susumo Ohno announced that each Barr body was an X chromosome, albeit a highly compacted one.
Silence of the Xs by TRAVIS, JOHN / Science News
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