title: Genetic variability of skeletal maturity in human twins.
mesh_terms: D000017:ABO Blood-Group System; D000293:Adolescent; D000365:Age Determination by Skeleton; D002648:Child; D005260:Female; D005826:Genetics, Medical; D006225:Hand / Q000000981:diagnostic imaging; D006801:Humans; D011247:Pregnancy; D014427:Twins; D014953:Wrist / Q000000981:diagnostic imaging
chemical_list: D000017:ABO Blood-Group System