Twin placentation and zygosity.
D000328:Adult; D000941:Antigens / Q000032:analysis; D001722:Birth Order; D001724:Birth Weight; D044383:Black People; D001789:Blood Group Antigens; D010064:Embryo Implantation; D005260:Female; D005306:Fertilization; D005313:Fetal Death; D005826:Genetics, Medical; D005865:Gestational Age; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D010063:Ovum; D010920:Placenta / Q000473:pathology; D011247:Pregnancy; D012737:Sex Factors; D014427:Twins; D044465:White People
D000941:Antigens; D001789:Blood Group Antigens