Alpha Omega Labs
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Definition Page:

Antigen -- a chemical substance by which the body recognizes the presence of a foreign, or invading agent. The cells of the body (all part of the immune system) which "recognize" antigens then work in concert to product "antibodies" (a separate class of immune defense cells) to fight off the invader -- a process sometimes loosely referred to the "humoral response" (antigen immune response). Antigens can come from toxins, microbes (bacteria, viruses, yeast, etc.), foreign blood cells, and cells of transplated organs.

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