Difference between Antigen and Antibody (Antigen vs Antibody)

Antigen is any foreign particle that elicits an immune response or that specifically binds to an antibody or a T-cell receptor (often used as a synonym for immunogen).
Antibodies or immunoglobulins are glycoproteins consisting of identical heavy chains and 2 identical light chains that recognizes a specific epitope on an antigen and facilitates elimination of that antigen. 
Difference Between: Antigen & Antibody


Antigens (immunogens)

Antibodies (immunoglobulins)
Any foreign substance that induce an immune response
Are glycoproteins formed in the body for combating antigens
Antigens are generally proteins but can be carbohydrates, lipids or nucleic acids
Antibodies are proteins
Triggers the formation of antibodies
Variable site has the antigen binding domain
The region of the antigen that interacts with the antibodies is called epitopes.
The variable region of the antibody that specifically binds to an epitope is called paratope
Antigens cause disease or allergic reaction
Protects the system by immobilisation or lysis of antigenic material
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