Inactivation system of the mammalian X chromosome.
D000818:Animals; D002869:Chromosome Aberrations; D004171:Diploidy; D006801:Humans; D008394:Marsupialia; D051379:Mice; D010828:Physiology, Comparative; D011123:Polyploidy; D012728:Sex Chromatin; D012729:Sex Chromosome Aberrations; D012730:Sex Chromosomes / Q000502:physiology*; D012737:Sex Factors