title: The use of twins in clinical research.
mesh_terms: D001724:Birth Weight; D001789:Blood Group Antigens; D005111:Extrachromosomal Inheritance; D005260:Female; D005826:Genetics, Medical; D006801:Humans; D008297:Male; D010375:Pedigree; D011110:Polymorphism, Genetic; D011247:Pregnancy; D012106:Research; D013476:Superfetation; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic
chemical_list: D001789:Blood Group Antigens