Showing posts with label Antigen. Show all posts
Showing posts with label Antigen. Show all posts

Antigen

Antigen, any substance that evokes the production of an antibody when introduced into the body of an animal. Antigens can enter the body through the respiratory tract, digestive tract, skin, or blood vessels. The most common antigens are proteins such as those found in bacteria and viruses. See also Allergy.

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