Antibodies are produced by a kind of white blood cell called a B cell. ... Although the general structure of all antibodies is very similar, a small region ...
http://en.wikipedia.org/wiki/Antibodies

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Antibodies (also known as immunoglobulins [1]) are gamma globulin proteins that are found in blood or other bodily fluids of vertebrates, and are used by the immune system to identify and neutralize foreign objects, such as bacteria and viruses. They are typically made of basic structural units - each with two large heavy chains and two small light chains - to form, for example, monomers with one unit, dimers with two units or pentamers with five units.Antibody forms · Isotypes · Structure · Function · Immunoglobulin diversity
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Antibodies are our molecular watchdogs, waiting and watching for viruses, ... Antibodies circulate in the blood, scrutinizing every object that they touch. ...
http://www.rcsb.org/pdb/static.do?p=education_discussion/molecule_of_the_month/p...

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Monoclonal antibodies (mAb or moAb) are monospecific antibodies that are identical because they are produced by one type of immune cell that are all clones of a single parent cell. Given (almost) any substance, it is possible to create monoclonal antibodies that specifically bind to that substance; they can then serve to detect or purify that substance.Discovery · Production · Applications · Examples
http://Monoclonal antibodies (mAb or moAb) are monospecific

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