title: The direct demonstration of an X-chromosome dosage effect prior to inactivation.
mesh_terms: D000818:Animals; D002875:Chromosomes; D004622:Embryo, Mammalian / Q000201:enzymology*; D047108:Embryonic Development; D005260:Female; D005821:Genetic Techniques; D007041:Hypoxanthine Phosphoribosyltransferase / Q000378:metabolism*; D007621:Karyotyping; D051379:Mice; D009030:Mosaicism; D011247:Pregnancy; D012730:Sex Chromosomes; D014960:X Chromosome
chemical_list: D007041:Hypoxanthine Phosphoribosyltransferase