> Information Center > Technical FAQs > Antibody Technology Column > What are antibodies, and what do they do?
An antibody, also known as an immunoglobulin, is a large Y-shaped protein produced by B- cells and used by the immune system to identify and neutralize foreign objects such as bacteria and viruses. ... Five isotypes of antibodies are found in different locations and perform different specific functions.
Antibodies are glycoproteins belonging to the immunoglobulin superfamily. They constitute most of the gamma globulin fraction of the blood proteins. They are typically made of basic structural units—each with two large heavy chains and two small light chains.
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