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n. Abbr. IgD
The class of antibodies found only on the surface of B cells and possibly functioning as antigen receptors to initiate differentiation of B cells into plasma cells.
immunoglobulin D (IgD)
one of the five classes of antibodies produced by the body. It is found in small amounts in serum tissue. Although its precise function is not known, IgD increases in quantity during allergic reactions to milk, insulin, penicillin, and various toxins. The normal concentration of IgD in serum is 0.5 to 3 mg/dL. Compare immunoglobulin A, immunoglobulin E, immunoglobulin G, immunoglobulin M.
immunoglobulin DAbbreviation: IgD
An immunoglobulin that is present on the surface of B lymphocytes and acts as an antigen receptor.
See also: immunoglobulin