title: Serum copper and ceruloplasmin levels in mentally retarded children.
mesh_terms: D001921:Brain / Q000254:growth & development; D002570:Ceruloplasmin / Q000032:analysis*; D002675:Child, Preschool; D003300:Copper / Q000097:blood*; D006801:Humans; D007223:Infant; D008607:Intellectual Disability / Q000097:blood*; D008831:Microcephaly / Q000097:blood
chemical_list: D003300:Copper; D002570:Ceruloplasmin