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Immunoglobulin G is a type of antibody that circulates in the blood and recognizes foreign particles that might be harmful.

An antibody (Ab), also known as an immunoglobulin (Ig), is a large Y-shaped glycoprotein synthesized and secreted by plasma cells derived from B lymphocytes, the plasmocytes, present in plasma that is used by the immune system to identify and neutralize foreign objects such as bacteria and viruses. The antibody recognizes a unique part of the foreign target, called an antigen.[1] Antibodies can be extremely selective for their ligand and are useful in several aspects of cell biology such as immunofluorescence microscopy and western blotting.[2]


  1. Charles Janeway (2001). Immunobiology (5th ed.). Garland Publishing. ISBN 0-8153-3642-X. 
  2. Bolsover, Stephen R.; Hyams, Jeremy S.; Shephard, Elizabeth A.; White, Hugh A.; Wiedemann, Claudia G (2004). Cell Biology. Hoboken, New Jersey: John Wiley & Sons. p. 445. ISBN 0-471-26393-1.