title: Effect of synthetic and natural sex steroids on X-chromatin.
mesh_terms: D000293:Adolescent; D000328:Adult; D003276:Contraceptives, Oral / Q000494:pharmacology*; D003280:Contraceptives, Oral, Synthetic / Q000494:pharmacology*; D004967:Estrogens / Q000502:physiology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D011374:Progesterone / Q000502:physiology*; D012728:Sex Chromatin / Q000187:drug effects*
chemical_list: D003276:Contraceptives, Oral; D003280:Contraceptives, Oral, Synthetic; D004967:Estrogens; D011374:Progesterone