title: Twinning and blood groups: cross-tabulation analysis for ABO, Rh, M-N phenotypes, and sex in a twin sample.
mesh_terms: D000017:ABO Blood-Group System; D005260:Female; D006801:Humans; D008951:MNSs Blood-Group System; D008297:Male; D010641:Phenotype; D011247:Pregnancy; D012204:Rh-Hr Blood-Group System; D012737:Sex Factors; D014427:Twins; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic
chemical_list: D000017:ABO Blood-Group System; D008951:MNSs Blood-Group System; D012204:Rh-Hr Blood-Group System