Letter I

Ig

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Abbreviation for immunoglobulin, a protein produced by plasma cells and lymphocytes.

Immunoglobulins are an essential part of the body's immune system which attach to foreign substances, such as bacteria, and assist in destroying them.</P> The classes of immunoglobulins are immunoglobulin A (IgA), immunoglobulin G (IgG), immunoglobulin M (IgM), immunoglobulin D (IgD) and immunoglobulin E (IgE).

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