IgD
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "IgD".

Some antibodies form complexes that bind to multiple antigen molecules.

Immunoglobulin D (IgD) is an antibody isotype that makes up about 1% of proteins in the plasma membranes of immature B-lymphocytes where it is usually coexpressed with another cell surface antibody called IgM. IgD is also produced in a secreted form that is found in very small amounts in blood serum. Secreted IgD is produced as a monomeric antibody with two heavy chains of the delta (δ) class, and two Ig light chains.

Function

IgD's function is to signal when the young B cells in the spleen are ready to be activated. By being activated, they are ready to take part in the defense of the body in the immune system.

See also

• Antibody
• IgM, IgA, IgE, IgG

External links

• MeSH Immunoglobulin+D

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