any one of a class of globular proteins which are antibodies and are produced by the immune system in animals.
A protein produced by plasma cells; an essential part of the bodyâ€(tm)s immune system. Immunoglobulins attach to foreign substances (antigens) and assist in destroying them. The classes of immunoglobulins are IgA, IgG, IgM, IgD, and IgE.
any of 5 classes (IgM, IgG, IgA, IgE, IgD) of antibody.