Relationship between the sex of the foetus and the amount of human chorionic gonadotrophin in placentae from the 10th to the 20th week of pregnancy.
D000032:Abortion, Therapeutic; D001681:Biological Assay; D006063:Chorionic Gonadotropin / Q000032:analysis*; D005260:Female; D005333:Fetus; D005865:Gestational Age; D006801:Humans; D007044:Hysterectomy; D007106:Immune Sera; D008297:Male; D010920:Placenta / Q000032:analysis*; D011247:Pregnancy; D011863:Radioimmunoassay; D012723:Sex
D006063:Chorionic Gonadotropin; D007106:Immune Sera