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antigen

An antigen is a foreign substance that triggers an immune response in the body. It can be any molecule or molecular structure that is recognized as non-self by the immune system. Antigens are typically found on the surface of viruses, bacteria, fungi, parasites, and other microorganisms, as well as on the surface of foreign cells, such as transplanted tissues or cells from another individual.

When the immune system encounters an antigen, it initiates an immune response to defend the body against potential threats. The primary goal of the immune response is to recognize, neutralize, and eliminate the foreign antigen to prevent infection or disease.

There are two main types of antigens:

1. Exogenous Antigens: These are antigens that come from outside the body and are taken up by antigen-presenting cells (APCs). The APCs then process and present these antigens to T cells, which initiate an adaptive immune response.

2. Endogenous Antigens: These are antigens that originate from within the body, such as those produced by infected cells or cancerous cells. Infected or abnormal cells process and present endogenous antigens to cytotoxic T cells, leading to their destruction.

The immune system recognizes antigens through specialized molecules called antibodies and T-cell receptors. When antibodies or T-cell receptors encounter specific antigens that match their binding sites, they bind to the antigens, marking them for destruction by other immune cells.

Vaccines work by introducing harmless modifications of antigens into the body to stimulate an immune response. This exposure allows the immune system to recognize and remember the antigens, so it can mount a rapid and effective response if the individual encounters the actual pathogen in the future.

Antigens play a crucial role in the immune response and are essential for the body's ability to defend against infections, recognize and destroy abnormal cells, and provide protection against future encounters with pathogens.

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