title: Diminished activity of platelet monoamine oxidase in Down's syndrome.
mesh_terms: D001792:Blood Platelets / Q000201:enzymology*; D002648:Child; D002675:Child, Preschool; D004314:Down Syndrome / Q000097:blood / Q000201:enzymology*; D006801:Humans; D008995:Monoamine Oxidase / Q000378:metabolism*; D012701:Serotonin / Q000096:biosynthesis / Q000097:blood
chemical_list: D012701:Serotonin; D008995:Monoamine Oxidase