title: Letter: Carcinoembryonic antigen in cystic fibrosis.
mesh_terms: D000293:Adolescent; D000328:Adult; D000937:Antigen-Antibody Reactions; D002272:Carcinoembryonic Antigen / Q000032:analysis*; D002648:Child; D003550:Cystic Fibrosis / Q000276:immunology*; D006801:Humans; D007106:Immune Sera; D007118:Immunoassay; D007223:Infant
chemical_list: D002272:Carcinoembryonic Antigen; D007106:Immune Sera