Timing of X-chromosome inactivation is stage dependent rather than age dependent.
D000818:Animals; D002875:Chromosomes / Q000502:physiology*; D002970:Cleavage Stage, Ovum / Q000502:physiology*; D005260:Female; D007041:Hypoxanthine Phosphoribosyltransferase / Q000096:biosynthesis; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D013997:Time Factors
D007041:Hypoxanthine Phosphoribosyltransferase