title: A SEARCH FOR NATURAL SELECTION IN SIX BLOOD GROUP SYSTEMS AND ABH SECRETION.
mesh_terms: D000017:ABO Blood-Group System; D000028:Abortion, Induced; D001789:Blood Group Antigens; D002648:Child; D005260:Female; D005298:Fertility; D005313:Fetal Death; D006801:Humans; D007223:Infant; D007246:Infertility; D008824:Michigan; D011247:Pregnancy; D012204:Rh-Hr Blood-Group System; D012641:Selection, Genetic; D013223:Statistics as Topic
chemical_list: D000017:ABO Blood-Group System; D001789:Blood Group Antigens; D012204:Rh-Hr Blood-Group System
keywords: ABO FACTORS; ABORTION; BLOOD GROUPS; CHILD; FERTILITY; FETAL DEATH; INFANT; MICHIGAN; PREGNANCY; RH FACTORS; STATISTICS; STERILITY