title: Terminology for twin zygosity.
authors.forename: G
authors.initials: G
authors.lastname: Machin
mesh_terms: D001294:Attitude to Health; D004200:Diseases in Twins / Q000235:genetics; D005260:Female; D006801:Humans; D008297:Male; D010290:Parents / Q000193:education / Q000523:psychology; D012660:Semantics; D009626:Terminology as Topic; D014429:Twins, Dizygotic / Q000235:genetics / Q000523:psychology; D014430:Twins, Monozygotic / Q000235:genetics / Q000523:psychology; D015053:Zygote