How to sign: any of a large variety of proteins normally present in the body or produced in response to an antigen which it neutralizes, thus producing an immune response
Categories: protein
Within this category: ABO antibodies, agglutinin, antitoxin, autoantibody, heterophil antibody, immunoglobulin, isoantibody, monoclonal antibody, opsonin, precipitin, Rh antibody