title: Letter: Gene dosage effect in trisomy 21.
mesh_terms: D002648:Child; D002675:Child, Preschool; D002904:Chromosomes, Human, 21-22 and Y; D004912:Erythrocytes / Q000201:enzymology; D005796:Genes; D006801:Humans; D007223:Infant; D013482:Superoxide Dismutase / Q000097:blood; D014314:Trisomy
chemical_list: D013482:Superoxide Dismutase