Antigen
Foreign substance that induces such an immune response in a host
An antigen is any substance that can cause an immune response in an organism. It can be a foreign substance, such as a virus, bacteria, or toxin, or it can be a self-antigen, such as a mutated cell or tissue. The immune system of an organism recognizes and responds to antigens by producing antibodies that can bind to and neutralize or eliminate the antigen. The process of recognizing and responding to antigens is essential for the immune system to provide protection against infections and diseases. Antigens can be used in various diagnostic tests, such as blood typing and pregnancy tests, as well as in the development of vaccines to protect against infectious diseases.
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