title: Dramatically different dizygotic twins: will we include them in Research? Twin research reviews: congenital anomalies, mirror-image effects in conjoined twins, older mothers of twins; Twin statistics: 'Massachusetts, land of twins'; Tribute: Dr Victor A. McKusick.
abstract: The increased frequency of interracial marriage is a likely source of unusual-looking dizygotic (DZ) twins. Some members of DZ twin pairs born to mixed-race couples inherit very different physical features from their parents. This raises several questions, such as: Will researchers wish to include such twins in their ongoing studies? Next, new twin research concerned with congenital anomalies, mirror-image effects in conjoined twins and older mothers of twins will be reviewed. New statistics on twinning rates in Massachusetts will also be summarized, followed by a tribute to the late medical geneticist Dr. Victor A. McKusick.
authors.forename: Nancy L
authors.initials: NL
authors.lastname: Segal
mesh_terms: D001699:Biometry; D000013:Congenital Abnormalities / Q000453:epidemiology; D004200:Diseases in Twins / Q000453:epidemiology; D006801:Humans; D009035:Mothers; D014428:Twins, Conjoined; D014429:Twins, Dizygotic / Q000235:genetics / Q000502:physiology*; D014430:Twins, Monozygotic / Q000235:genetics / Q000502:physiology*