Classification and nomenclature of morphological defects.
D000015:Abnormalities, Multiple / Q000145:classification; D002869:Chromosome Aberrations / Q000145:classification* / Q000150:complications; D025063:Chromosome Disorders; D000013:Congenital Abnormalities / Q000145:classification* / Q000209:etiology; D004777:Environment; D005796:Genes; D013577:Syndrome; D009626:Terminology as Topic