title: What causes the excess left-handedness in twins?
authors.forename: W H
authors.initials: WH
authors.lastname: James
mesh_terms: D005260:Female; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D011247:Pregnancy / Q000378:metabolism / Q000523:psychology*; D015995:Prevalence; D013739:Testosterone / Q000378:metabolism*; D014427:Twins
chemical_list: D013739:Testosterone