title: Abortion: a hypothesis on the role of ABO blood groups and placental alkaline phosphatase.
mesh_terms: D000017:ABO Blood-Group System; D000022:Abortion, Spontaneous / Q000276:immunology*; D000469:Alkaline Phosphatase / Q000276:immunology*; D001787:Blood Group Incompatibility; D005260:Female; D006801:Humans; D008297:Male; D010641:Phenotype; D010920:Placenta / Q000201:enzymology*; D011110:Polymorphism, Genetic; D011247:Pregnancy; D014327:Trophoblasts / Q000201:enzymology / Q000276:immunology
chemical_list: D000017:ABO Blood-Group System; D000469:Alkaline Phosphatase