title: Noonan syndrome and trisomy 21 mongolism in sibs.
mesh_terms: D000015:Abnormalities, Multiple; D000293:Adolescent; D002648:Child; D002904:Chromosomes, Human, 21-22 and Y; D012734:Disorders of Sex Development / Q000235:genetics; D004314:Down Syndrome / Q000209:etiology / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D010375:Pedigree; D010641:Phenotype; D011247:Pregnancy; D011859:Radiography / Q000009:adverse effects; D012729:Sex Chromosome Aberrations / Q000209:etiology / Q000235:genetics*; D013577:Syndrome; D014314:Trisomy; D014424:Turner Syndrome / Q000235:genetics*