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Medical Definition of Lyonization
1. The inactivation of an X chromosome. One of the two x chromosomes in every cell in a female is randomly inactivated early in embryonic development. Named after geneticist mary lyon. (12 Dec 1998)
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1. The inactivation of an X chromosome. One of the two x chromosomes in every cell in a female is randomly inactivated early in embryonic development. Named after geneticist mary lyon. (12 Dec 1998)