Noonan syndrome in twins.
D001827:Body Height; D002648:Child; D004200:Diseases in Twins; D006326:Heart Auscultation; D006344:Heart Septal Defects, Atrial / Q000235:genetics; D006801:Humans; D008297:Male; D011666:Pulmonary Valve Stenosis / Q000235:genetics; D013163:Splenomegaly / Q000235:genetics; D014424:Turner Syndrome / Q000235:genetics*