title: Letter: An antigen associated with pregnancy.
mesh_terms: D000510:Alpha-Globulins / Q000302:isolation & purification*; D000941:Antigens / Q000302:isolation & purification*; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D006801:Humans; D011247:Pregnancy; D011263:Pregnancy Trimester, Third; D014594:Uterine Neoplasms / Q000276:immunology*
chemical_list: D000510:Alpha-Globulins; D000941:Antigens