a plasma protein containing the immunoglobulins that are responsible for immune responses

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

one of the most common of the five major classes of immunoglobulins; the chief antibody in the membranes of the gastrointestinal and respiratory tracts

one of the five major classes of immunoglobulins; present in blood serum in small amounts

one of the five major classes of immunoglobulins; present primarily in the skin and mucous membranes

one of the five major classes of immunoglobulins; the main antibody defense against bacteria

one of the five major classes of immunoglobulins; involved in fighting blood infections and in triggering production of immunoglobulin G