title: Determination of zygosity of multiple births using simple observations.
mesh_terms: D001789:Blood Group Antigens; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D010920:Placenta / Q000033:anatomy & histology / Q000473:pathology; D011247:Pregnancy; D011272:Pregnancy, Multiple; D011783:Quadruplets; D012737:Sex Factors; D014310:Triplets; D014427:Twins; D014428:Twins, Conjoined; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic
chemical_list: D001789:Blood Group Antigens