title: Placentation and zygosity of twins in Northern Nigeria.
abstract: Details of placentation and zygosity are reported from a survey of 627 consecutive twin births at three hospitals in Northern Nigeria. Zygosity was determined by study of sex, red cell antigens (ABO, MNSs and Rh) and placental enzymes (PGM1, PGM2, PGM3 and Pep A). The proportion of DZ twins amongst the various ethnic groups in this part of Nigeria is intermediate between that found amongst Yorubas in Western Nigeria and populations in the U.S.A. and England.
mesh_terms: D001789:Blood Group Antigens; D005260:Female; D005312:Fetal Blood; D006801:Humans; D008297:Male; D009549:Nigeria; D010920:Placenta / Q000201:enzymology; D010929:Placentation; D011247:Pregnancy; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic
chemical_list: D001789:Blood Group Antigens