title: Natural selection: a study of ABO, Rh and erythrocyte acid phosphatase types among aborters and non-aborters.
mesh_terms: D000017:ABO Blood-Group System; D000022:Abortion, Spontaneous / Q000097:blood*; D000135:Acid Phosphatase / Q000097:blood*; D001787:Blood Group Incompatibility; D004912:Erythrocytes / Q000201:enzymology*; D005260:Female; D005298:Fertility; D005787:Gene Frequency; D006801:Humans; D010641:Phenotype; D011247:Pregnancy; D012204:Rh-Hr Blood-Group System; D012641:Selection, Genetic
chemical_list: D000017:ABO Blood-Group System; D012204:Rh-Hr Blood-Group System; D000135:Acid Phosphatase