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  • Immunoglobulin (Ig): SFAF
    see antibody.
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    • Antibody (AB, Immunoglobulin, IG):
      1. Antibodies JAMA
        Molecules in the blood or secretory fluids that tag, destroy, or neutralize bacteria, viruses, or other harmful toxins (antigens; see). They are members of a class of proteins known as immunoglobulins, which are produced and secreted by B lymphocytes (see) in response to stimulation by antigens (see). An antibody is specific to an antigen.
      2. Antibody (AB, Immunoglobulin, IG): SFAF
        an immunoglobulin protein secreted by activated plasma cells, which evolve from B-cells. Antibodies are present throughout the blood and tissues; they are produced in response to stimulation by foreign antigens as part of the body's defense against disease. Specific antibodies bind to and act upon specific antigens; the antigen/antibody reaction forms the basis of humoral (TH2) immunity. Neutralizing antibodies destroy or inactivate infectious agents, while enhancing antibodies promote infection. There are 5 classes of immunoglobulins: IgA, IgD, IgE, IgG and IgM. See also immunoglobulin A-M.
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