title: On X inactivation in XO embryos of mammals.
mesh_terms: D000818:Animals; D004622:Embryo, Mammalian; D005260:Female; D006570:Heterochromatin; D008322:Mammals; D011247:Pregnancy; D012729:Sex Chromosome Aberrations; D012730:Sex Chromosomes
chemical_list: D006570:Heterochromatin