title: A possible mode of action of progestagen-only oral contraceptives.
mesh_terms: D000371:Agglutination; D001769:Blood; D003276:Contraceptives, Oral / Q000494:pharmacology*; D003470:Culture Media; D004958:Estradiol / Q000494:pharmacology; D004964:Estriol / Q000494:pharmacology; D005260:Female; D006801:Humans; D008297:Male; D008858:Microscopy, Phase-Contrast; D011374:Progesterone / Q000494:pharmacology; D013048:Specimen Handling; D013094:Spermatozoa / Q000187:drug effects*; D013739:Testosterone / Q000494:pharmacology
chemical_list: D003276:Contraceptives, Oral; D003470:Culture Media; D013739:Testosterone; D011374:Progesterone; D004958:Estradiol; D004964:Estriol