title: Letter: Complement components in cystic fibrosis.
mesh_terms: D003165:Complement System Proteins / Q000032:analysis*; D003550:Cystic Fibrosis / Q000097:blood / Q000276:immunology*; D006801:Humans; D005779:Immunodiffusion; D007074:Immunoglobulin G / Q000032:analysis; D008970:Molecular Weight
chemical_list: D007074:Immunoglobulin G; D003165:Complement System Proteins