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What is lyonization?

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Random inactivation of one of the two X chromosomes in every female cell at the very early developmental stage of embryo is called lyonization.
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The inactivation of the X chromosome (one of the X chromosome in every cell of the female) is inactivated randomly during an early embryonic phase called Lyonization. It is named after its founder Mary Lyon. The inactivated X chromosome is called as Barr Body.
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