title: Unexplained infertility and ABO blood group incompatibility.
mesh_terms: D000017:ABO Blood-Group System; D001787:Blood Group Incompatibility / Q000150:complications*; D005260:Female; D006801:Humans; D007246:Infertility / Q000097:blood / Q000209:etiology*; D008297:Male; D012661:Semen / Q000276:immunology; D013073:Sperm Agglutination
chemical_list: D000017:ABO Blood-Group System