title: Letter: C3 standards?
mesh_terms: D001800:Blood Specimen Collection; D003176:Complement C3 / Q000032:analysis / Q000592:standards; D003165:Complement System Proteins; D000939:Epitopes; D006801:Humans
chemical_list: D003176:Complement C3; D000939:Epitopes; D003165:Complement System Proteins