Difference Between Antibody and Antigen

Antigen and antibodies are two very different entities. In a nutshell, an antibody is a glycoprotein which is produced in response to and counteract a particular antigen. On the other hand, an antigen is a foreign substance (usually harmful) that induces an immune response, thereby stimulating the production of antibodies.

Difference Between Antigen and Antibody

Antigen

Antibodies

Also called

Also called Immunogens

Also called Immunoglobulins

Molecular Type

Antigens are usually lipids. However, they can also be proteins, carbohydrates and nucleic acids

All antibodies are proteins

Effect

Antigens cause allergic reactions or even illnesses

Protects against the effects of the antigen either by lysis or immobilization of the particle

Specific Binding Site

Epitopes are regions of the antigen where interacts with the antibodies

Paratopes are variable regions of an antibody that binds to an epitope.

Origins

Antigens have origins outside the body

Antibodies always originate within the body

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Frequently Asked Questions on Antigen and Antibody

What is the difference between antigen and antibody?

An antibody is a glycoprotein which is produced in response to and counteract a particular antigen. An antigen is a foreign substance that induces an immune response, thereby stimulating the production of antibodies.

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