title: C3d as a marker of extra-articular features in rheumatoid arthritis.
mesh_terms: D001172:Arthritis, Rheumatoid / Q000276:immunology*; D003176:Complement C3 / Q000032:analysis*; D015933:Complement C3d; D006801:Humans
chemical_list: D003176:Complement C3; D015933:Complement C3d