title: Evidence of immunosuppressor factor in the serum of women taking oral contraceptives.
abstract: The serum of women taking oral contraceptives is able to inhibit an in vitro cytotoxicity reaction at the cell level. This effect is nonspecific. It seems to be due to the presence of an inhibitor of the lymphocyte activity and acting at the membrane level. This factor looks like that described in expectant mothers except that it exhibits a lower activity. This difference makes it possible to consider that its emergence depends on a specific hormonal impregnation.
mesh_terms: D001798:Blood Proteins / Q000276:immunology; D003276:Contraceptives, Oral; D003602:Cytotoxicity, Immunologic; D005260:Female; D012739:Gonadal Steroid Hormones / Q000276:immunology; D006801:Humans; D007108:Immune Tolerance; D066298:In Vitro Techniques; D011247:Pregnancy
chemical_list: D001798:Blood Proteins; D003276:Contraceptives, Oral; D012739:Gonadal Steroid Hormones