_:b723691 . "A human early embryonic event in which in any given cell one of a female's two X chromosomes becomes inactivated and converted into a Barr body. After inactivation has occurred, all descendants of that cell have the same inactivated X chromosome. Thus, X-inactivation creates cell clones with differing effective gene content. An organism whose cells vary in effective gene content and hence in the expression of a trait, is called a genetic mosaic.NCI" . _:b723691 . . _:b723691 . . "C20674"^^ . "X-Chromosome InactivationPTNCI" . _:b723691 . "X-Chromosome Inactivation"^^ . "X InactivationSYNCI" . "C0043297"^^ . "X-Chromosome_Inactivation"^^ . "X Chromosome InactivationSYNCI" . . "X-Chromosome Inactivation"^^ . "Genetic Function"^^ .