Antigen: Is a substance usually protein

Antigen is a substance usually protein in nature and sometimes polysaccharide, that generates a specific immune response and induces the formation of a specific antibody or specially sensitized T cells or both. Antigens (Ag) are substances that are foreign to the body and trigger an immune response, producing antibodies against them. An antigen is a substance or an element that has the ability to induce an immune response. Antigens are foreign substances and they are known to provoke the immune system to produce proteins known as antibodies, which act upon these antigens to eliminate them from the host. Antigens are foreign, which means that they are introduced into the body through certain mechanisms such as pathogenic infections, carcinogenic elements, induced immune reactions, etc. As foreign elements, antigens can be ... Learn what antigens are, how they trigger immune responses, and what types of antigens exist. Explore the structure, properties, and examples of antigens with BYJU'S website.