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- a substance engendered in an organism by the presence of a foreign material, especially bacterial proteins; an antibody is specifically antagonistic to the antigen or substance under whose influences it was formed
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
- also called an immunoglobulin, it is a protein produced by a lymphocyte in response to exposure to an antigen and reacts very specifically with that antigen.
Source: Jenkins, John B. 1990. Human Genetics, 2nd Edition. New York: Harper & Row
- An immunoglobulin protein produced by B-lymphocytes of the immune system that binds to a specific antigen molecule.
- A protein molecule produced and secreted by B cells in response to an antigen, which is capable of binding to that specific antigen.
Source: Biotechnology Glossary
- An antibody is a protein component of the immune system that circulates in the blood, recognizes foreign substances like bacteria and viruses, and neutralizes them. After exposure to a foreign substance, called an antigen, antibodies continue to circulate in the blood, providing protection against future exposures to that antigen.