title: Stability of genetic determination from age 2 to age 9: a longitudinal twin study.
authors.forename: H
authors.initials: H
authors.lastname: Lytton
authors.forename: D
authors.initials: D
authors.lastname: Watts
authors.forename: B E
authors.initials: BE
authors.lastname: Dunn
mesh_terms: D001824:Body Constitution; D002648:Child; D002675:Child, Preschool; D003071:Cognition / Q000502:physiology; D014644:Genetic Variation; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008957:Models, Genetic; D012919:Social Behavior; D014427:Twins / Q000523:psychology*