GENERAL HISTOLOGY

Detailed explanation-1: -An antigen is any substance that causes your immune system to produce antibodies against it. This means your immune system does not recognize the substance, and is trying to fight it off. An antigen may be a substance from the environment, such as chemicals, bacteria, viruses, or pollen.

Detailed explanation-2: -“An antigen is a molecule that initiates the production of an antibody and causes an immune response.” Antigens are large molecules of proteins, present on the surface of the pathogen-such as bacteria, fungi viruses, and other foreign particles.

Detailed explanation-3: -There are three types of antigens, classified based on where they are produced. Self-antigens, or autoantigens, are produced in the body’s own cells; endogenous antigens are produced in intracellular bacteria or viruses; exogenous antigens are produced outside the body and are foreign to the immune system.