title: Twin study summaries.
authors.forename: Nancy L
authors.initials: NL
authors.lastname: Segal
mesh_terms: D001321:Autistic Disorder / Q000175:diagnosis / Q000235:genetics; D003118:Color Perception / Q000235:genetics; D004200:Diseases in Twins / Q000175:diagnosis / Q000235:genetics; D005260:Female; D036281:Genetic Research; D005820:Genetic Testing; D006801:Humans; D008297:Male; D011247:Pregnancy; D011272:Pregnancy, Multiple; D018433:Twin Studies as Topic