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.

Comments

Popular posts from this blog

Cream, Butter, and Ice Cream

Deoxyribonucleic Acid

How HIV Causes Infections